and i can't imagine an iphone and an android phone even being compared to each other for more than just screen quality because they're two different beasts. they both have their pluses and minuses, but it really depends on what you want. for att phones, i'm sure they have android phones that are probably a lot better than the evo at this point, since its pretty old now considering what else is out there.
Samsung Galaxy S II Skyrocket Specs, Features (Phone Scoop) the samsung looks nice. they do sell android phones...
personally though, speaking as a sprint customer for 10+ years, they were my third carrier. they've been the best. and they're by far the cheapest, and their customer service has ALWAYS hooked me up. my phone breaks, no ins, they send me a new one. the touch pro sucked, i hated it... kept crashing, custom roms didn't make it any better, the casing was breaking, they sent me the bb tour... it didn't have wifi or any real app capabilities, i needed image editing and ftp management... so they sent me the evo. i dunno, people bitch about sprint, as if the other carriers care any more about their customers.