If you are aiming for a high score and k/d ratio hunters the best. A bladedancer will generally net more kills with their super and got the best defensive/offensive movement ability in the form of blink. In a pure 1v1 scenario with supers up a striker titan generally beat a bladedancer though. When it comes to warlocks there are a few sunsinger builds thats great for both 1v1 (rumble) and group pvp. The top players usually play hunters because of their skillsets. That being said you can excell with all classes since its mainly about gun skill, positioning and map awareness.