HTC Hero seems to trounce the myTouch 3G -- it's really hardly a contest. The myTouch is certainly lighter, and in many ways "feels" smaller because of it, but the size differences really are negligible. They're still both great phones, but the Hero really feels like a million bucks, while the myTouch feels a bit like a toy. Unfortunately, only one of them just went up for pre-order on T-Mobile, and it's not the one we want to marry.
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HTC Hero vs. T-Mobile myTouch 3G... fight!