Return of Reckoning

Please help a new player to choose final class. From al the class pulls i leveled till lvl 22 only choppa and BG. Been swapping a lot and these two probably give the most satisfaction. Choppa - because when guarded and healed have nice gameplay and numbers. But when he doesnt have that I just die instantly.
BG on the other hand I feel that in any moment i can give my team value.
Pls help.
Although I like the choppa looks most of all out of all classes

then go with Choppa and don't care when you die. It only gets better the higher RR you get and with proper wb setup you can rip through your enemies.