I prefer deep drops, mostly because I have fairly large hands. I also like them because it means that my elbows can be less bent in the drops (I find the 90 degree elbow position to be quite uncomfortable). I find the deep drops perfectly comfortable for long rides.

I greatly prefer ergonomic drops, although I do like the stiffness of traditional curved steel bars. I've never found any traditional curved bars where I felt that the bendy portion could fit my hands comfortably, so I always end up keeping my hands a little lower and having to move them to brake.

I may be a complete oddball, however. I like to use wide bars, keep my brake levers very far forward, and the bar-ends pointing higher than my brakes.