L4D: Zoey, she relates a lot to the attitude I used to have.
L4D2: Nick, I like his attitude as well. Besides, he's the coolest looking survivor.

Zoey's better than Nick.

The best infected is the Jockey, or at least the one i'd want to become. The hunter seems too pissed off to really interest me, but the Jockey seems to have so much energy and insanity that it just seems more interesting than the Hunter.