I would not want an assisted opener, because in my experience, every so often, the blade does not open all the way, for whatever reason. Maybe it is being gripped wrong, maybe it's clogged with gunk, or maybe something gets in the way of the blade as it opens--in any case it is not a 100% reliable system. What if the moment of truth arrives and your blade is half opened, and with your stress level off the charts, you don't even realize it?
I would like something with a positive flipper guard like the CRKT M16's. Otherwise with any thrust you are very likely to cut yourself as well as your opponent. Make mine a black blade. If possible, I will have it already out and opened when the SHTF, and a black blade will not draw the eye, especially if lighting is poor.
Finally if there is a model name etched on it, make it something like "Workman's choice" or "Ol' Whittler." If it's "Zombie Eviscerator" or "Devil's claw" the prosecutor will have a field day with that at your trial.