I don't know, Brad. Never seen a fader on a good sounding amp. And all those Beatles pictures are full of knobs. I'd be willing to bet that Pink Floyd records were made with knobs whilst Steely Dan records were made with faders. Large knobs also tend to have a pleasant diffusion effect due to the rounded caps. Faders, as we all know, tend to have concave finger surfaces, the worst for those critical console early reflections. And then there's the dirt issue, no open tracks with knobs. It goes on and on.
The thing I can't figure out is this. When my console faders are being controlled by the automation there is a toothed wheel which moves a continuous toothed rubber band that holds the fader and wraps around a pulley at the other end of the fader travel. Now, the fader travel is linear, no doubt, but the mechanical motion which drives it is circumferential. So, does it sounds good or not?
Damn this stuff confuses the heck out of me.