From my experiance so far alliance wins most of the games im in. Iv won roughly 80 percent of all my wsg matches. The queue times for alliance are longer than horde but it pays off by not getting farmed all game. As for not being able to solo a geared lvl 20 or 24, this is not true. I have 2 shot peaple with 1500 health. I mainly go for hunters tho, If they have less than 1200 health I usually kill them in 2 seconds.