Okay, I'll admit I'm taking the least popular stand, but my favorite is the disc. With a little relief around it in the handle, like on the old Benchmade 970, it is for me the best, most absolutely never-fail opening method. I've had holes fail to engage my thumb on occasion, but never the disc.
Am I the only one who'd like to see a blade disc replace the thumb studs on the BM710 Axis Lock (along with an M2 blade, of course)?
I don't hate the Spydie-hole, though, far from it (Lord knows I've got enough Spydercos); I just like the disc even better.
-- Carl