Depends on what I'm doing with it. If I'm going cut something, I'll either use the thumbstud, or just pull the Axis bar back and let the blade fall open. When I'm just playing around with it, I'll flick it or whatever.
I don't generally flick it open because when I'm going to cut something, I don't need to accidentally drop the knife trying to look like a badass when I'm open it.
The same applies for Spyderco's compression lock. I use the hole or just let it fall open when I'm using it, but it gets some flicking when I'm just playing around.