(Pocket-lint) - Sports watches are smartwatches but they have some specialisms - notably, they tend to have GPS so you can track fitness activity as you go. 

Familiar names persist: Garmin and Polar offer some of the best sports watches, adding the connectivity to give you more from your smartphone, more analysis of your data and better presentation.

There are decisions to be made - do you want the accuracy of a heart rate chest strap or the convenience of wrist-based HR? Do you have a preference for the platform the data will sync to? Are you interested in a wider ecosystem?

Buying a running watch is a very personal thing, so here's a rundown of the best watches on the market starting with our top running watch.

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Garmin Fenix 6 Pro

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The Garmin Fenix 6 Pro is an outstanding sports device, with enough intelligence to compete in the smartwatch category too. It offers a substantial build, a range of sports metrics and a genuine two week battery life. 

It's not cheap and you'll find some of its features on other Garmin sports watches for less money, but whether you're training for a 5K, about to finish your third Ironman or are on a multi-day adventure race, the Fenix has something for you in terms of functions. 

It's impossible not to applaud a device as comprehensively impressive as the Fenix 6. As multi-functional sports-focused smartwatches go there's no equal.

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Garmin Forerunner 945

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The Garmin Forerunner 945 is Garmin's top multisport watch. The functions it offers very much match those that you get on the Fenix 6 - so it basically does everything - but it's priced a little cheaper than the Fenix because it doesn't have quite the same build and protection. If you're not planning on abusing it in the great outdoors, you might find it's the better choice for you.

The 945 offers mapping - which the 935 didn't - as well as offline music and Garmin Pay, so it's very much the complete package. Not only that, but it's accurate, has a great battery life, is slim and comfortable to wear and offers you one of the most comprehensive sets of data that you'll find on a sports watch. It's smart too, giving you notifications, and if you're an Android user, smart replies to messages as well.

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Garmin Forerunner 645 Music

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The Garmin Forerunner 645 Music is a wonderful running watch. It doesn't offer all the metrics you get with the Forerunner 945 or the Fenix 6 Pro - but it supports Garmin Pay and offline music, including Spotify while also offering smartphone notifications and customisations.

This sports watch has a lovely compact design that is comfortable to wear, excellent sports and activity tracking, and it sits on a platform that doesn't just track that activity but it excels in delivering your stats too.

Garmin Pay isn't hugely supported and the battery life of the Forerunner 645 Music could be better, but overall this is a fantastic running device.

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Polar Vantage V

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The Polar Vantage V is a flagship device that will track and monitor your daily activity, sleep, sport-specific training and give you feedback. There are great metrics for runners particularly, along with great running training programmes and you'll find plenty of support for other sports too.

The wrist-based heart rate monitor isn't the best in the market - offering slightly dubious results at times - and a lot of the great data requires the Polar website, but the Vantage V is comfortable and the Polar Flow system has some great elements.

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Garmin Forerunner 935

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The Garmin Forerunner 935 has been updated with the 945, but it's still very complete.

The data that the Forerunner 935 gathers is comprehensive, not only taking those basic running metrics like your heart rate and GPS location - both fantastically accurate, but also altitude data, training status, your stress levels and estimations for things like VO2 Max and your power to weight ratio.

Beyond that, it's a lovely watch to wear, offers a battery that will see you through a full week easily, as well as giving you tracking for events over 24 hours and support for a full range of sports and activities.

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Garmin Vivoactive 4

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The Garmin Vivoactive 4 offers great multi-sport tracking at a sensible price point. It is a versatile smart fitness watch that offers a long-lasting battery life, lightweight design and it tracks multiple activities, not just running so it's a great option if you like to mix it up every once in a while.

Its screen isn't as impressive as the likes of the Apple Watch or Fitbit Ionic but the Garmin Vivoactive 3 still offers great GPS and heart rate tracking and it delivers plenty of detail through the Garmin Connect app. You also get a couple of extra features on this device like Garmin Pay and offline music, so it's a complete package.

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Polar Vantage M

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The Polar Vantage M has a lot to admire if you're looking for a sports-first smartwatch. It's comfortable to wear, there is plenty of support for sports and there are some great training programmes too.

There's no on board music storage or payments and the heart rate sensor can be a little hit and miss, but the Polar Flow environment is great and the Polar Vantage M will do everything most users will want, even if it isn't as accomplished as the Vantage V. 

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Fitbit Charge 4

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The Fitbit Charge 4 offers all the normal lifestyle tracking that Fitbit is known for - steps, sleep - but in the Charge 4 is adds GPS, meaning it's a lot more capable as a device for those who want to throw in the occasional run as well. 

We say occasional, because the size of the display means you can't see a huge amount of information and because this is a compact device, the battery won't last as long as others on this list - especially if you're using the GPS to track a lot of events. But, it's affordable, it's discreet, and it's accurate enough, it just won't give you as complete a set of metric as some of the more advanced devices here.

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Fitbit Ionic

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The Fitbit Ionic is the brand's attempt at creating a smartwatch that's as savvy with fitness as it is with its connectivity. It's a no brainer for those looking for a more advanced device who are already in the Fitbit ecosystem, a great upgrade for someone who finds that an older device just doesn't give them enough information.

Importantly, the Ionic covers major sports - running, cycling, swimming - rather well, with integrated GPS and heart rate tracking. But it's all wrapped in a light and compact design that's less bulky than a lot of the watches on this list. From a runner's point of view the presentation of the information isn't as customisable as you'll get from Garmin and the Fitbit app is more geared towards lifestyle tracking than running performance, but for casual runners, that might be what you need.

The display is lovely, vibrant and far from boring, but the cost is that it only really offers four days of battery life.

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Apple Watch Nike

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If you're an Apple iPhone user, then the Apple Watch delivers a first class smartwatch experience. The Nike version of the watch has been designed for runners, although the only real unique options are the strap and the watch faces from the Nike Running app. Otherwise, the Apple Watch supplies you with wrist-based heart rate tracking and GPS, returning accurate results.

The running metrics aren't as full as you'll get from the other devices on this list, but if it's only basic run tracking that you're after then the Apple Watch will do that for you, while also giving you the advantage of a full smartwatch experience. There are Nike versions of many recent models, including the new Apple Watch SE. The downside is you only get 1 day of battery life.

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Garmin Venu

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The Garmin Venu is Garmin's answer to devices like the Apple Watch, offering an OLED display to boost the visuals over all the other devices it offers. That means this watch is nicer to look at than anything else the company does - but it takes a big hit on the battery life as a result.

To back up its credentials, it offers a full range of functionality, essentially the same as the Garmin Vivoactive 4, so that's offline music, Garmin Pay and all the sports functions you'd expect from Garmin. If you want a watch that has a great display, this could be the model for you, if you are happy to accept the hit to battery life.

Writing by Chris Hall.