Rogue is the most expensive class to play, just so you know. For PvE the potion consumption is astronomical, and not optional. Not going to say much on PvP - even near-maxed rogues can get one-comboed on a regular basis. Unless you have 5K hp, you're going to spend a lot of time dead. I don't see much difference between a dead rogue and a dead mage.

That being said, I prefer rogue for elites, but for things like kraag tomb farming, mage takes the cake.