The longer the game, the more satisfaction in victory and disappointment in defeat for me
What Is Your Favorite Kind Of Chess?
I play much more blitz than I play standard, but only because I mostly haven't got much time on my hands. I do prefer taking my time however – makes for a much more interesting game as the probability of making a blunder decreases (for either player of course).
Apparently, blitz chess is rather discouraged, to a point where it is even made fun of by top level players here, look at this: http://www.chessquotes.com/topic-blitz
Have fun! :)
I say blitz.
Reason: Not too fast, not too slow, and very fun and exciting.