I like studs that tuck into the handle when a blade is open. Disks do give a much greater surface area for grabbing, but I like how the studs when designed as above with the handle tuck away, leaving less things to catch onto other things.
(In my whisper voice, I now prefer large spyderco opening holes over everything so far. I switched from spyderhole to studs, and have come full circle... er hole.)