Let's be honest, Alliance has around 4 or even 5 PvP guilds while Horde has <Ohdo> and what else? Warbringers do premades and it ends there.
Alliance has, in all reality, about 70% of PvP geared and active people of this server.
A big number of them are ex horde, some were even leaders of guilds here or members of the most known ones.
I know at least 20 BiS and skilled 'loyal' Horde members pre-moltdown who ran to the Alliance, and if I started calling names here it would just cause yet another drama to start so I leave it to them.
And I assure you that these 'Alliance guilds' would be nothing without them. We would at least have balance.
But hey, Horde has <Ohdo> and that's enough, right?
Hail <Ohdo>.