Each one if better for different people and different applications. For most folks conventional springs and adj. rate shocks will give them 75% of the adjustability they`ll actually get out of a coil over. With the advent of things like our SPC tubular lower A arms with adj. ride height the gap closes even more. Coil overs will allow faster changing of springs and a bit easier shock adjustment and a small weight savings. On a race car those things may be important and a few select street cars that see a lot of track time may benefit as well. Coil overs also allow a large enough range of adjustability that if the end user isn`t well versed in their use they can set them totally wrong and cause problems. There are no fail safes. It`s much harder to set up a conventional coil spring/shock combo wrong. With comparable motion ratios,spring rates and dampening rates both configurations will perform exactly the same. Basically we sell a lot of coil over conversions but we probably still talk more people out of them than into them. Mark SC&C