Very hard choice man! My buddy has a RSR on his car and its WAY too quiet for me, basically its like stock exhaust but better flowing. I havent really heard the WS2 from real close up but from what I remember its a lil louder than the RSR, but not LOUD by any means still very quiet.

So i guess it depends if you want to hear a lil something or almost nothing at all. Youll be good with either one though, both are great!