Mobile fast firing with good gun handling tank of your choice. Fast firing is important for steal killing, mobility so you can keep up with the front or run away as needed. Arties are easy kills at the end if you are on the front lines.
Try to get into a firing position early which can shoot into 2 areas where tanks commonly congregate to maximise your choice of targets. eg centre of Prok.
Mine choice was the E50 with the 88mm gun for ramming lols. Gold rounds helped with the faster shell velocity and longer range sniping when the opportunity presented itself.