I would have to say pocket 6s. I hit more sets with 6s than any other pocket pair or maybe it just seems like it. And it's easy to get away from if I'm facing heavy action.

Now to turn the question on it's head: least favorite hands?

I hate AJ with a passion. I will not play them unless I open the pot in late position. And KK, they always fail me on the bubble for some reason.