From what I have heard/seen, there's one major difference: the battlefield runs on an economy of sorts. Bullets, respawns, vehicles all have a cost, while actions will pay you. Killing someone gets you money, but driving a squad near a poi will also net you money. Transporting supplies, reviving someone, clearing out mines... basically everything gives you money, so there's a huge incentive to do other things outside of just shooting and killing (the usual best way to farm score points in other games like this).