The only reason I back WinMo is b/c of the ease at which you can sync your files using MyPhone, can open Office documents for FREE! and can easily be customized by generous people on the internets..usually all for free.
Yes WinMo is lacking in its Marketplace, but it will get there. Android is nice, but too much like an iPhone wannabe. widgets? Icons for apps are more manly
I've seen a Nexus One and the only thing nice about it is the form factor and 2.1. otherwise, its just like the G1..android just gets boring after you see all it can do and realize it is limited..