If you want a show stopper the CT is the way to go. The diablo is best in roadster trim, but either way, both cars are awesome. For investment I think the CT will do better, however the Roadster seems to be maintaining its value as well. Imo both cars are fun to drive, it is just personal tastes. My wife perfers our Diablo whlile I perfer our CT. Its a mixed bag. Good luck.