Does it matter which colour? All the teams are the same, it’s not like you can specialise.
Even in games like Battlefield that do have different equipment available to different teams, no gaming group would specialise in one or the other.
Edit: Realised you’re probably thinking in terms of ensuring everyone’s on the same team as currently you can’t see who’s on which team until you’re in the game, and you have to choose team before joining. I can’t believe this will remain true for long.