A couple of WoW questions. please take a look:)?

Well I've played WoW for nearly 3 years. Horde seems to be the more mature approach but less fun. Whereas the Alliance seems to contain a lot more players consisting of younger players aswell as older players too. As far as cles go.. espiecially for PvP I would be rolling a mage or a warlock. One because Mages do insane damage and can teleport away from damage, and secondly a Warlock because of the curses, fear and the minion. Both cles are amazing at damage and PvP, but you gotta know how to play any race for it to be good. All cles are equal it just depends on the player.