It will eventually be your decision
I currently own numerous phones and carry a Samsung Focus and a HTC Inspire 4G.
When it comes to the Windows Phone/Android argument, it is all a matter of taste as well as software used, and sometimes the level of "geekdom" someone may be prone to.
I came from a background of all types of phones, dumb and smart alike. I left an iPhone 4 because it was a closed world without jailbreaking. You needed to jailbreak to install some of the better non-conforming apps in the app market. That is a whole other world though.
I joined into Android because it had an app market similar to Apple's, which would allow me to switch devices and only lose a few apps that I used a lot. I used Android for about 2 years before Windows Phone 7 emerged.
I bought the Samsung Focus because I had Windows Mobile phones in the past and have always been a PC user. Kind of like a PC to PC match, so to speak. The marketplace isn't super large yet, but is growing. I can find most of the major apps I used on iPhone as well as Android, but still not all, that is why I still keep an Android phone, too. Eventually, I will drop the Android phone, too.
I like the Windows Phone UI. The live tiles on the home screen allow for a glance and go type of feature, if the app supports them. The pictures tile, contact tiles, Xbox Live tile all have movement to them that allows you to see something extra. The other things I like about the UI is the menus and settings where they look minimalistic, but yet they can be informative as well with explinations about what the toggle does.
Not to say that Android does not do that, but the use of numerous different sized fonts to me is much fresher looking than Android's iPhone like look. I know Android can be skinned as well as rooted to add extra functionality, as well as widgets, but sometimes an excessive amount of adjustment can be a pain just as well as none at all.
I am not totally biased to Windows Phone over Android, but I do lean towards Windows Phone.