i've got a HTC Radar, which is a w7 phone, and from my experience (girlfriend has a galaxy2 which is android) android is still the superior platform.
for windowsphone you basically have to pay for EVERY LITTLE FUCKING THING you want to do with it.

even if you want to be able to install 3rd party apps on your phone which DONT come off xbox live, you have to 'unlock' your phone which is a PAID service.
andriod supremacy > all