I guess my weapon of choice is the BR. Something about the AR makes me want to run into a room full of enemies and get killed with grenades before I even hit anyone. But both have their time and place. I try to get power weapons as much as possible. Well really just rockets. I'm rubbish with the laser and while I try my best with the sniper its better off in one of my teammates hands.
I would say BR/AR or BR/Needler is when I feel most comfortable. But I'm not very good.