What should you get HTC HD2 Or htc hd7?

HTC HD7 comes with Windows 7, which is a farely good OS. it has its advantages over HTC HD2. But, the final decision depends on what one want to do with the mobile phone.
However if you buy a HD2, you can load, Andriod & Windows 6.5 at the same time, as well you can NOW flash WP7 onto a HD2.