mef, after reading the manga..............this is a very, very tough decision.
Lets see, Team Rocket is pretty much ruthless. They lie, steal, and kill to get what they want, and their leader is literaly all over the place. And the female outfits makes them look like hookers
Team Aqua; I love them dearly but I cant swim :[ and besides their leader abandons them and goes bonkers. Although I do like their outfits, its nice and BA.
Team Magma; I dislike the overuse of firetypes, and the outfits cover your entire body. And if my memory serves me correct, their "secret" lair is inside an active volcano. That is a no-go for me. Also their leader is old, hence not very attractive lol.
Team Galatic; uhhhh, are those wigs or did they really die their hair? If I were to join Team Galatic they better promote me to Commander Neptune or Venus.