What's the best operating system on the HTC mobiles?

Android, hands down.

The thing with HTC operating systems is that they all look pretty much the same. They call it “Sense UI” and it looks the same on WinMo and Android (not sure if HTC uses Web OS). So really thee only difference is going to be the apps you can download and specific features that come with Android and WinMo. Aesthetically speaking it won’t look much different across either platform.

Windows Phone 7

when it comes out

Otherwise, android. Windows mobile 6.5 is dogshit, dont bother.

They’re mostly known for Win mo but their Android stuff is the best. And as for their acquisition of Palm, we still dont know enough to make a decision.

Google Nexus One, running Android. That phone makes me drool.

Android, because of flexibility. The HTC T-Mobile MyTouch 3G Slide is cheap and amazing.