Guild Wars 2

War, Thief, Necro. are probably your best bet.

If picking solely on classs, Warrior. Best across the board class in the game right now. They roam, skirmish and WvW effectively and are also highly desired in dungeon runs.

That said play style has more to do with it. I have several 80s a couple of which I am pretty decent with but I still prefer my thief (non D/P) even though the shine of the class has worn a bit because I find it more fun to play.