Best Teams in Multiplayer?

So because this season is getting over and Flashpoint DS is the reward, I was wondering what teams are the best in MP for me to focus on, because I currently already have Batman Ninja Catwoman and Batman Ninja Batman, so either I spend my nth metal on nightwing or spend it on getting FP Batman or Aquaman.

OR

Should i ditch the idea of getting a team and just focus on getting great gears first (liek TT, or MDC, or somethign from nth metal pro pack)