The game is heavily unbalanced in factions with the majority players being Raven. Neither faction has an advantage over the other it's just all about looks.
Raven are a futuristic faction their guns looks retarded imo you can't tell the different between most of them when your arming them. Characters look weird imo running around in black tight suits
S.V.E.R look like free radicals or anarchists haven't seen their guns ingame but they look cool.
Valor is more modern traditional military style with guns most will recognize and their characters look like a bunch of Arnold Schwarzeneggers in the 80's running around with with huge muscles.
I'm valor right now but I may go to S.V.E.R in the full game if I decide to get it because right now I'm not all that impressed with the beta.