Im basing it on what I see used by racers locally, and the materials used in their manufacture. apex-i uses lightweight materials, but its costs a lot...(just an example), and their tunability, TEIN makes many, many versions of their coilovers, with varying spring rates to suite whatever use YOU need them for, and apex makes 2 versions, with the n-1 being fully revalveable to your specs, and 24 point adjustable..
JIC seems to make a good "almost great" product, everyone I;'ve talked to seems to think they represent a strong value, but arent quite a "race setup", but many people only THINK they want a race setup...
I have never had experiance with buddy club, nor have any information about them(ignorance about them, thuisly I dont post about it.)amnd ZEAL...well I just plum forgot. ZEAL b-6's are nice, and I would rank them pretty high.
there ya go man

-chet