As far as many hp ratings on clutches, I'd say most are fair, though hard to say how long they can last under abuse near that actual rating, which also means it's good to have one over rated for your needs.. With any clutch, if it's not excessively slipped & grips tight enough to not slip under full power, it could live a good life.
Just like with
batteries, there are only really a few actual manufacturers, but so many different ways the are specked out. LUK is a main one. Also to mention , there are some clutch repair shops that can reconfigure & upgrade clutch pads, pressure plate springs, swap input spline sections, etc.