Just started this week with 3v3 (pretty new to hunter). I tried the different specs in Bg's first.
Survival is fun, BM is cool cuz of the stun and the exotic pets ofcourse. But I had a hard time controlling the pet. With the buffs MM got I respecced to MM and love it imo.
Just try out, and see what you like. It won't matter unless youre gonna aim for a high rating.