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 data to detailed observations of your running style. In short, GPS watches are becoming essential tools in the runner's arsenal.
Consider the ways you plan to use your fitness tracker before purchasing one. For example, outdoor runners and cyclists will get more use out of a device with built-in GPS connectivity. Users who are looking to measure only basics such as steps and burned calories might not need to splurge on a feature-rich model.