I am an experienced WoW player and i am looking for a challenge at leveling. I hear Rogues and Mages are a challenge. But i am not sure which one to go for. I know there two different playing styles but i am going to go with first answer i see.

A rogue is my main so I leveled him way back in BC so I don't know how much different it is now. However, I did just recently level a mage and it wasn't to bad. I would say leveling a rogue is probably more fun. You can stealth by any enemies you don't want to fight which saves A LOT of time. If you level as subtly you can one shot pretty much all of the guys you need to kill which is nice lol. But for a challenge I'd say level the mage, but for more fun I'd say level the rogue.