The game's release was primarily about PvE, but there were some notable exceptions. In terms of PvE alone race, racial skill had WOW TBC Gold less impact than the overall impact of Paladin/Shaman discussing 40 players. In this case, the main focus is Alliance. Everyone is familiar with PvE, and they can do it at home. A plethora of guides and videos that make them easy and easy to master. The real "challenge" nowadays is PvP. In the smaller group game the differences between Paladin and Shaman is not as great but the differences in racials is noticeable...and that's why Horde becomes the meta faction.
The notion that one side is made up of "better players" than the other is absurd. Think about the steps required for deciding either side. There is absolutely nothing that separates or obstructs someone from being able to buy WOW Classic Burning Crusade Gold pick one side or the other