After years of being around adjustable coilovers and adjustable shocks w/ fixed springs, I'll make some notes:
For race track duty, fully adjustable suspension is the way to go, to allow precise adjustment to different tracks and conditions. This is an environment where fractions of a second for a 2-minute lap matter loads. Time is time an fractions build lap-after-lap into leads and falling behind.
That said, some of the fastest racers don't use them, as they can drive around whatever the quirks of a setup for a track and mainly want close and reliable quirks they can manipulate into advantages even.
On the road, most adjustable suspensions really aren't changed much, if ever, after the "newness" wears off. Either the drivers hit a "sweet spot" and just don't mess with it OR it i left in an "imperfect" setting because the driver gets too busy to "fix" it or it becomes too much "trouble" and "bother" to deal with it.
The ultimate reality is this:
Tracks are used for A race-> a set piece of "road" over a set group of weather and track conditions. So, a set-up can be "dialed in" to fairly precise settings for a specific driver in those specific conditions on that specific track. In the next race, those will be different- even for the same driver and same track.
Roads change constantly and a road-car goes over a huge variety of road conditions in a huge range of weather conditions. Unless a driver stops, gets out, adjusts the suspension, and fine tunes during a drive, the suspension is seldom "dialed in" exactly correct for where it is.
So, coilovers are more desirable for track than street. On the street, the gap for a good "static" suspension set-up compared to coilovers is MUCH less and within a good driver's abilities to make the difference.
Each had pros and cons more than a simple list, as specific sets of either suspension type are better or worse for specific drivers.
It is far, far more complex than I can post here . . .
Or than I understand . . .
