All of them can be good in AC. Thor isn't ideal for it and is much better suited for PVE. DP and BP can be excellent PVP characters with the right build I.E. max dodge(75%), HP over 40k, max Cooldown Reduction, an Obelisk with ITGB and Invincibility. An CTP of Authority would be great for either for AC. BP does very well with a Refinement, but DP wouldn't be ideal for one. A CTP of Destruction on DP gives him pierce and makes him great for TL, but I'd say Authority would be better for AC because of the Invincibility.