Best emergency folding-knife opening method (stud-hole-flipper-disc)

For an emergency wilderness knife, I think that the best choice would be a fixed blade. Easiest to find and draw when freezing, and sturdy enough to perform wilderness duties.
 
I would also have to say Wave, followed by flipper.

If you're talking conventional openers, I woud prefer a disk over a hole or stud, as it's larger and easier to catch on something to open.

If you have anything with a hole (i.e. Spyderco) you can "Wave" it by using a zip tie in it.

I personally do not trust assisted openers or automatics if my life may depend on it. I have had both fail.
 
I say a waved spydie, two possible options. Last choice, other then nail nick, would be a flipper IMO...
 
Butterfly. Seriously.

Latch can get caught on something to open it if injured, nothing to get gunked up, and excellent strength.

true, but it requires dexterity to open one-handed safely.
if your hands are cold or wet, I'm not sure how well you could do.
 
I have a few autos and really don't think they offer much advantage over a well designed manual folder. Even as a paratrooper, I found too much manipulation needed to use it one-handed and even tried to when I landed into a bunch of trees (I was just hanging and curious to see if my folder was still in my pocket and how well I could use it even though I didn't need to cut any risers). Enter the Emerson with Wave...this is possibly the fastest opening on-handed folder using the most basic gross-motor skills. You can still use the disk or hole depending on the model, but the less manipulation needed, the easier to deploy when needed under stress.

ROCK6
 
Assisted with thumb stud and the bump that sticks out the back. If you can't use the stud you can push the knife against something and it'll open.
 

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