I would recommend the Samsung Wear Galaxy 4 watch range especially if you are likely to go back to Android phone. The Galaxy 4 rnage will work with any Android and is a joint develop by Google & Samsung. It already can work with Google Fit and many other Google apps. It has great operation with Smasung Sleep app if you are interested in tracking your sleep activity. I get about 36 hours out of mine but I track sleep so put watch in sleep mode over night and recharge over breakfast each day. I use a Nokia 7.1 phone and watch works well with that but any recent Android phone should be OK Also regular updates rolling out had three this year and they just work so smoothly