Favorite class combo for questing/world content

[Scummer]

Two Paladins. The fact they're a hybrid means you can do any spec combo you like. Even if both are ret you still have the ability to heal each other should things go bad. In general though I think it's their diversity.

[Ryuji]

In terms of killing power I'd bet on an Arms Warrior + a Rogue.

In terms of beating the crap out of tough stuff, I'd go with Arms/Fury Warrior + Ret/Holy Paladin.