I'll agree that OEM is consistently the best, and OEM friction plates and springs are all you need.

And yep, I've also encountered old plates that looked good and measured in spec that were hardened, glazed, or contaminated and just wouldn't grip very well.

Unless they're badly blued, warped, damaged, etc. the steel plates can easily be re-used. As above, scuffing or sandblasting can help make sure everything has the best grip.

Some folks have installed three aftermarket springs and three new OEM springs for somewhat firmer grip at the expense of a harder clutch pull and less feel. This is usually not needed.