Nope no idiots guide to clutches.?
I'll tackle this with the basics.
Clutch choice really depend on your usage and are a big part of tuning your rig.
Stock clutch (6000rpm) may be ok with stock rigs but when you start upgrading engine power,heavier/beefier parts and accessories - you'll find that stock clutch isn't up to the task or doesn't perform the same.
Upgrading specs will generally result in you purchasing a better rated clutch to handle the upgrades.
Low rpm (6k)clutches aren't good with heavier rigs because clutch engagement is too low and outside of the powerband causing slow speed starting, bogging and sluggish behavior.
You'll need a higher rpm clutch/spring to move the engine into its power band to get the vehicle moving.
(*You can buy just higher rpm springs to change that (7K - 10k)
Or you can buy a higher rated clutch with better materials,giving you a more reliable + stronger setup.
Word of mouth/Forums, can help lead you in the right direction to picking a good cluch.
it's also something that you'll have to learn for yourself as to what gives you the best drivability for you.
What you use your rig for will also determine what clutch is best,ie: bash/race.
Theres a lot of over complicated clutches and it's best to stay away unless you have a specific use case for them - racing generally..
Clutch issues: Heat/overheating,spring fatigue and clutch pad wear.
IE: 2,3,4 shoes + aluminum,carbon fiber pads ,thicker springs etc are just variations for strength,longevity and heat fatigue resistance/failure.
All those choices you see are just manufactures ways of addressing these issues,some are better then others
Zen clutches along with F&S clutches are great choices to start.
I switched to F&S clutches.
They are all metal,so you get less slippage and solid engagement.
(+ no clutch pads to wear down or dust.)
I recommend F&S for solid reliability and ease of use .
The higher end engines usually will have a list of reccomended clutches and other parts needed for reliability.
As I said this is a simple explanation of clutches,rewritten many times for length