Well, I've been using the Aria for about 2 days now. The iphone isn't looking so shiny anymore. Android does what iOS doesn't. Better integration between contacts, photos and calendar items between other programs and web services. iphone seems to treat everything as a separate application with very little integration. Simple things, like a notification area and being able to better customize alert tones, make Android better then iOS.
Ok, where is Apple better, the antenna debacle aside, the iphone is a better designed device then the HTC. The iphone is simply a work of art as far as construction goes. Applications are another. Everyone makes iphone apps, Android is catching up, but its not there yet. I also wish the Aria was bigger, but ATT seems hell bent on keeping Android second fiddle as long as they control the iphone in the US. I don't care for the Samsung experience and think HTC has the superior interface.
So which device would I rather use, as of right now Android is my pick. It could change if Lord Steve makes some major changes to the iOS. It was great 3 years ago, its now showing it age compared to the competition.