biggest feature to me, thumb dial for in Manual mode. If you shoot in M, you'll appreciate that part a lot.
the 60D is supposed to have a slightly faster auto focus then the T2i and less, but i'm not sure which AF ended up in the T3i I think it's the slower one however.
if you're out and about a lot, the 60D is supposed to be more rugged.
the 60D shoots a higher frames per second.
if you use a tripod lots, the 60D also has a horizontal level built in, which is nice to get things flat.
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