When you want to play a simple match that has nothing to do with puzzles or campaign, which one do you choose?

I choose Custom because I get to pick my team and landscape.

Ever since I've finished all the campaigns / puzzles / etc. I only play multiplayer. I just can't stand how dumb the computer can be, yet have amazing aim at the same time.

Custom, because at least you can choose Hard AI. Also, personally, I have a practice team from WWP that I liked, and I replicated it here. I'd rather choose all teams than get a bunch of worms with random names speaking French and Spanish.

Edit: Oh, but Quick Game is good on a ten-minute train ride. It really lives up to its name. :)