Best Class Guild Wars 2 - PvP

I think it will be quite difficult to pick a "best" class for anything. ArenaNet is doing a great job designing it so every class has multiple uses depending weapons/skills/traits, etc. If you read the second part of the interview on GW2Hub main page, Jon Peters talks about interesting builds like the haste-rezzing thief that not even the developers anticipated but was playing a crucial role in PvP. I think if you pick the class that you best enjoy (mechanics, story, look, etc.) you will be able to find a combination of weapons and skills to excel at PvP.