Neither of those are really ideal for 2 Teams - Stalker is outclassed by Ranger, while Booster is okay if it's ram (allows for other players to cover for you if you need to retreat.) Predator is a better option because of its larger effective range, while Fighter does much better with crowd control.
I would recommend Landmine, but Landmine is so much better in Maze (the 13-second invisibility just cripples its surprise factor, as well as it being a crap tank otherwise.)
There's no real good mix of a tank that's good in 2 teams and can be stupidly fun to use - except maybe ram Annihilator, but that's hard to use. Ram stalker is the best thing I can come up with or a 3/10/10/10 Spike.