It all depends on if you are coming from really far away. If you are coming far away, make sure that you ride all of the really good coasters at CP (TTD,MF,WT,MXL200 etc.) It also depends on if you hit all the coasters at CP in those two days then i would suggest going to SFWoA. But if you are coming from not that far away you could always come back another time for WoA. There indeed are some unique rides at WoA that you should check out (X-Flight, B:KF).