The 360 controller always feels awkward to me, I've gotten used to the range in the analog sticks on PS1/PS2/PS3 controllers. I'm really comfortable with the layout on the Playstation controller, too. I think it was well thought-out back in the PS1 days and they were smart to stick to it.
However, just based on looking at the controllers and comparing them from a more objective point of view, I think the 360 controller is probably better. The placement of the sticks, and the trigger buttons are what make me feel this way. Even though I personally dislike both of those things, I'm aware of the fact that once I got used to them more I would probably prefer it. Externally, the 360 controller seems better made, too. Internally, I think the Dualshock 3 trumps it though.
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