Having autocrossed on both, I think my setup speaks for itself (That means yellows, BTW )

Honestly, they're both good shocks. The damping of the illuminas is pretty good, and the adjustment is OK. I find the yellows have a stiffer "stiff" setting, and a wider range of adjustment. I honestly think these are the best shocks I'll ever need. (and considering how anal I am about my susp, thats saying a lot).