Clutch judder is rarely the clutch
Gearbox input shaft wobbling up and down is fairly likely
Engine mounts are also fairly common
Engine not running correctly also fairly common
I would first look through the inspection hole at top of the gearbox, if there is oil in there it will need clutch, bearing, oil seal
To answer your question I prefer the "feel" of the original AP clutch to transmech or blue print ones but that said they all get the job done
I believe Valeo "feel" good and depending on budget will probably try one next
Make sure you order the correct one the 69hp are slightly bigger and some online sellers are selling the cheaper smaller clutch for the 69hp as it still fits