Diaphragm clutches are easier on your knee than B&B types - that's their claim to fame,
their selling point. More bite from less pedal effort...
Same sort of deal with hydraulic linkage vs. stock type mechanical - less effort for the
same work done, which supposedly justifies the added cost and fabrication required.
Me, I still prefer the old B&B type. I like feeling the actual mechanical workings of a clutch
under my foot ('course, I grew up with clutches in vehicles from the 30's on up thanks
to Pop).
Despite my own "left knee of mush" (docs have been trying to get me to get it replaced
the last 40+ years now!), I still am most comfortable with the stock arrangement of clutch
because I like feeling it working.
Helps monitor the situation, as it were.
Now, my absolutely favorite clutch setup I've ever driven? The one in my old '89 5.0 Mustang.
That one was diaphragm, but with cable-driven linkage on the pedal, complete with self-adjuster.
It gave me the best of both worlds IMO - you still felt the workings of the clutch to an extent,
while also having easier operation of it as the cable did its' thing to soften the working of it.