I like capture the flag mostly only with friends, as we know who will do what, and it stinks to play with someone who doesn't read the rules first. This being so different, and making each game really more unique and challenging, I voted for two. The credits are better, generally, but that again depends in part on your team. I prefer to play with more ships on the water, but having to have equal sides makes for a long wait to fill up. If I start the list, people don't want to be patient once there's two on each side everyone says START!
I wish there were less lobbys, more people in a lobby so the games would fill faster, and the option of playing the traditional pirates game.