It depends on what kind of tournaments you want to play. 5-man tournies will be bigger and you will probably run into some better teams. 3-man tournies are generally smaller more local tournies, and generally you run into teams that won't stomp you into the ground.
Mowing muppets since 2003!
"I always get hit within the first minute of the start of the game!"
"Why don't you hide behind a bigger bunker!"
-dialogue between me and a new kid at our field