I am someone that has just ditched Windows 10 mobile (Lumia 950) for an Apple iPhone and Watch. My priority was a good fitness tracking watch. I looked into the Android Wear very closely but after widespread reading I concluded that the Apple Watch is the best smart watch out there that does fitness well. I bought the Apple Watch Sport series II with aluminium gold casing and cocoa sport band. The Android Wear watches generally had lousy optical heart rate monitors (often without the ability for continuous tracking), and were big and bulky. I ruled out things like Fitbit since they can't pair with an external heart rate monitor. I have been very happy with my purchase. The Apple Watch is insanely useful with highly accurate fitness tracking, seamless syncing to the iPhone, great Siri integration. The battery life is fine since I charge the Watch and the iPhone at the same time in the evening and both last the day easily with around 60% to spare even with GPS runs etc. I am sure the new Google watches coming out in the next couple of months will be good too, but I have learnt in the tech world to buy what is good and works now rather than buy into promises (lesson learned from buying into Microsoft promises for Windows 10 mobile).