The best running watch or GPS sports watch is a personal choice and much depends on the amount of detail you want from your runs.
Beyond just simple tracking and pace information, the latest watches will feed back everything from heart rate information to detailed observations of your running style. In short, GPS watches are becoming essential tools in the runner's arsenal.
Essential reading: How to use your watch to be a better runner
Of course, there's no one perfect watch, so we've highlighted our top pick below but followed up with other devices that have impressed during our tests and that might suit different budgets and preferences.
Wareable's top pick
For its list of extra features that go beyond simple run tracking, the TomTom Spark earns its place at the head of our best running watches list.
As well as the usual running metrics (distance, speed, time), it has a built-in optical heart rate monitor which aced our tests, it plugs into nearly every running app going and has storage for MP3s, which it'll play via a pair of wireless headphones. The feeling of running unencumbered by your phone isn't to be underestimated.
We also love the watch's option to race yourself on previous routes, adding a competitive edge to your training. In short, the Spark is a lot more fun to train with than any of its peers.
In depth: TomTom Spark review
Best for tracking your recovery
Garmin Forerunner 630
Garmin's flagship watch now adds smartphone notifications on the wrist as well as a host of new metrics. You can view data on stride length and vertical ratio which can be used to boost running efficiency, and there's a renewed focus on recovery.
The Forerunner 630 rates lactate threshold and performance condition to try and prevent overtraining, and warns you when you're pushing things too far. It's strictly for the hardcore runner who also wants great smartwatch-inspired features. If you've got the money to spend, it's one of the best running watches available.
In depth: Garmin Forerunner 630 review
Best for high-end data
The perfect training timepiece for swim-bike-runners, the Polar V800 tracks everything you do on two wheels, two feet, in the water or on dry land. Pace, distance, fat burn calories and max heart rate are all covered on super clear screens that are brilliantly customisable.
Pair it up with a Polar H7 heart rate monitor and you can also unlock the V800's zonal training smarts, making sure you're sweating it out to achieve the right effect. Hook it up to a shoe pod and it'll also give you cadence, stride length and other insights to help hone your Mo Farah running form. Wannabe Wiggos can also opt for a range of cycle accessories to increase the stats haul from two-wheeled training.
What it reveals while you workout is one thing but this smartwatch keeps giving long after you've sunk your post-workout protein shake. The Recovery Status and Orthostatic Test features predict when you'll be ready to train again. The V800 also doubles as an activity tracker and lets you see whether your daily calorie burn comes from just being alive, workouts or general activity.
Best for 24/7 fitness
Garmin Forerunner 235
The Garmin Forerunner 235's mix of features is perfect for intermediate runners looking to step up their training. The key feature here is the optical heart rate sensor on the back, which is capable of tracking steady runs, but you'll want to to don a chest strap for higher intensity workouts.
For those looking for a general picture of overall health, the daily activity stats and resting heart rate tracking is superb, as are the notifications and battery life.
In depth: Garmin Forerunner 235 review
Best companion app
Fitbit's most powerful wearable to date is looking to take on the smartwatches by adding smartphone notifications, but it's still the Surge's fitness prowess that wins out here.
Onboard GPS makes for accurate route tracking, a week long battery keeps you going without the need for a charger and the rubber construction is durable, if a little on the itchy side. It's also the first Fitbit device to pack an actual display, even it is only a monochromatic touchscreen.
However, it's the app that really shines. Running data has never been so easy to digest, with graphs on your performance. What's more, the data will be seamlessly added to your daily goal, so you get the full benefit for your workout.
In depth: Fitbit Surge review
Best on a budget
Basically a more affordable take on the Polar V800, the M400 is a brand new watch that tracks pace, distance and altitude via built-in GPS. But that's not all, as this beautiful looking running companion comes with some special skills too.
On top of 24/7 activity tracking that means you can ditch your fitness band, there's a whole host of running-specific innovations to keep you moving and motivated. There's an interval timer that can be tuned to time or distance for custom training session, plus it'll even give you an estimate of when you'll finish your run based on your current pace.
For those who get lost easily or often run on their travels, there's a cunning back-to-start option that'll directs you to your starting point in the shortest distance possible.
If you're looking for improved performance – and most of us are – the Polar Running Index calculates how you're (hopefully) improving over time based on heart rate and speed. It'll also tell you the training effect of every single run.
In depth: Polar M400 review
Best for the trails
Suunto Ambit 3 Sapphire Peak
For the serious athlete, Suunto's Ambit3 boasts accurate tracking capabilities thanks to GPS and some nifty connectivity tech. Pair the watch up with the Suunto Movescount app to alter settings and check progress on your phone. The watch itself is jammed full of sensors, from a compass to a heart rate monitor (that even works during swimming) and altitude checker plus of course it uses the GPS to give you route guidance.
Best for triathletes
Garmin Forerunner 735XT
The recently announced Garmin Forerunner 735XT features advanced metrics for running as well as the pool, and will keep tabs on your stroke type and efficiency in the water. It's waterproof to 50m, combines with the companies' high-end bike sensors and offers 24 hours of GPS tracking.
Best for adventurers
Garmin Fenix 3
The update to Garmin's previous all-action sports watch, the Garmin Fenix 3 is perfectly suited to runners that have broken beyond the confines of the pavements. Cycling, open water swimming and even cross-country skiing are all supported, but it's running where the Fenix really earns its stars. When paired with the heart rate strap accessory, the Fenix 3 tracks distance, elevation, cadence, vertical oscillation and V02 max, and the Garmin Connect software is simply brilliant.
In depth: Garmin Fenix 3 review
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Best smartwatch for running
Moto 360 Sport
If you don't fancy the SmartWatch 3, the Moto 360 Sport is well equipped for indoor and outdoor running sessions. It's robustly built with a silicon case and band and features an AnyLight LCD touchscreen to swipe through and easily view your stats in the bright outdoors or at night.
Motorola's Moto Body app is also surprisingly well designed, making your data easy to digest on the move.
In depth: Moto 360 Sport review
Best for runners who do more than run
If you've had your eye caught by the Android Wear Sony SmartWatch 3, the Garmin Vivoactive is the company's response. Smartwatch style notifications and the ability to read emails and messages are the order of the day, along with built-in GPS for smartphone-free run tracking, plus cycling, swimming and golf. Yes, it's a bit of a jack-of-all-trades, but the updated Garmin Vivoactive HR version even has built-in optical heart rate.
In depth: Garmin Vivoactive review