Recommendations on Fitness watch

I currently have a Polar A360 which is about 2+ years old. I like it but is it time for it to retire as even with ordering new bands the 'watch' part comes out and now the battery cover is not staying attached. I am a consultant (seated a lot) and a yoga instructor. I am looking for something that looks nice for work and for working out.

Activities: Yoga, Walking, Running, Spin, lifting and hiking

Important factors: sync to phone and scale (have the polar scale already), slim design, heart rate monitor, water resistant

Nice to have: downloaded music, gps, text and email

I like that the Apple watch has the active calories and resting calories break out. I am currently considering the Polar M600, Fitbit Ionic and Apple Watch. Also The main reason I am considering the Polar is that I have used it for years and have so much data stored on it as well as my custom Active Metabolic Assessments and heart rate zones. I worry that I will have an expensive scale that doesn't sync to anything and lose years of data. Yes my data is stored here but just calories and activity. The polar has reports on intensity and the benefits of the work outs.

Thanks to all in advance.