This is my take on this:
Mages are super useful, they provide portals, food and water, crowd control and are good at pvp and pve. (People want you in their group)
Hunters although eaiser to level may find it harder to get in raids (however they are needed for their tranq shot) They deal good single target damage though ( I think)
Just choose whatever faction you want, I've played alliance my whole life and decided to level a horde character, and I was bloody surprised. So much content I've missed out on.
(PS. Russian text is profanity filter eg: вау)