I personally prefer the xray shocks. the clickers are just too awesome to pass up.
If you having trouble getting equal rebound on all 4 it might be because there is a slight burr on one or a few of the pistons. what I do is polish the edges of the piston by putting the shaft into a dremil and sanding the piston ever so slightly. so that the piston is absolutly smooth.
(1500 grit)