My POV, as a symbain user who recently bought both Android (for myself) and Windows (for my mom) - Windows Os still has a lot to sort out. Minor quirks make it cumbersome to use. I'm sure all such issues will be sorted out in the future. Battery backup is great, Os is extremely fluid.
Android - Is a battery hog
. Still, I am happy I chose android for my myself. In fact I even feel that Android could have been slightly better for my mom also.
My vote goes for Android, until Windows catches up.
android for it speech to text commands only.
Voice commands are working fine on my Lumia as well. Yet to try out Google voice on my android. Heard good things about it.