I had Aldan's for a few years, then going over a rough RR track, I blew both front's out, so I replaced all four with QA-1's. Even though I did not buy the double adjustment (wish I had) their a much better coil over than the Aldan's.
Everyone has their favorites, but as long as you buy one of the top 5 company's, for street driving, you won't see a lot of difference's. If you're road racing you car, that can be a different story and can make a big difference. Either way you go, pay the extra for the double adjustables. My singles rebound to fast and plan on replacing them someday.
It's also a good idea to scale your car, I did and wow, what a great change it made in the suspension and driving. Either buy or make a "strut" for all four corners or just two and set the fronts then backs. My car's weight was way,......of on all corners. Now even with a BB motor, the corners are about equal and 51% front-49% back.
Amazing difference ! I made my struts but you can buy them as Speedwat Motors in Lincoln Ne.
Let me know if you want more details.
