I play both sides, and go back and forth often. Its easy, if you don't like how one side is going, change sides.
This doesn't mean it will work out to your benefit. I've had bad luck and no matter what toon I was on, I got slaughtered. Sometimes it's just not your day for PVP. Best bet is play with 3 of your good friends and hope for the best. I always feel really lucky when I get 7 of my friends in my group. This is a rare treat, but it can happen. Even in regular wz's.