I initially had the RD Springs with my EDC and liked them. No complaints, great springs! I have since picked up some KW V3s from Auto Talent and they are the business. Nothing better as far as I'm concerned. I sure don't miss the EDC the V3s are just so much better.
I dont think you can go wrong with coils or springs. Is money/ a consideration? If so get springs if not get V3s.