Playing Pokerstars vs playing UB with rakeback

I'm mostly a ring game player, so obviously rake effects me. I don't believe pstars offers any rakeback program but I know ub does. Should I just transfer my money to UB and get the rakeback program or does PStars have enough going for it that I should stick with Stars

Also, does the rakeback program in any site give you rakeback for tournament fees? Or is it strictly for ring games.