The One looks great but I can't do it on Verizon. I also prefer a removable battery and have a couple of spares for my Nexus now. I haven't played with the new version of Windows 8 mobile or whatever it's called so I may check it out. I have multiple Google accounts on my phone and use Drive and other apps constantly on it. I know that I can get them on Windows but I want to stay with Android to keep it as smooth as possible when using Google's services.
If you want smooth integration with Google, WinPhone8 is probably not the platform for you. I don't think there are any official Google apps for Windows Phone 8 at all. SkyDrive integration is excellent, of course, Office exists on the phone, etc. WP8 does do GMail natively, as well as Facebook and Twitter (with or without those individual apps) and when you add a Google account to your phone, your Google address book and calendar become integrated with the native contacts and calendar apps. But if you want Google Play Music access you'll have to find an app in the market for that, and the same for every other service. No Google Drive except by third parties, no Google Plus except by third parties, no Google News, no Google Maps, Voice, Talk, none of it from Google Inc., only third parties.
On WP8, though, Nokia Maps is arguably better because the maps are offline (but not satellite imagery) and the directions are always spot-on for me. Nokia HERE City Lens is awesome sauce, etc. One thing about WP8 Store.. the ratings on Windows Phone 8 apps are far more accurate than I ever remember them being on Android. I seem to recall nearly 5 star apps simply not working or being really buggy, and every 4-5 star app I have on WP8 is truly 4-5 stars. Not sure why that is, to be honest.
WP8 has the live tiles which don't exist on other platforms, and no notification area (the tiles ARE the notification area) which all other phones have. This alone is enough to shy folks away from WP8, I think. Instead of a thin bar across the top for notifications, my entire screen is a notification screen, widget screen and launcher; it's all the same screen.
It's a matter of taste, I suppose. Though, I think you'll need to have some time with a WP8 device before you can truly know it, and I think that is the reason adoption isn't higher.
I understand why people like Android. My family all has iphones & ipads, though, and I've used them plenty. I do not see the appeal at all. Not at all.