Another resurrected thread from almost 2 years ago, but still interesting points from back then and today --> @
D
dragonram7
I'll chime in anyway because I enjoy such topics

I agree with most of what was said, I do carry firearm and knife and I did draw both of them in self defense occasions, in the States and back in Europe/Russia (CCCP in those days...)
As some brought it up first priority would be to de-escalate the situation, run, leave, do it anyway, who cares...
However, when you have to defend yourself with any tool, knife or firearm will do it effectively only if you deploy it as fast as you can and present it ready to use.
A regular training with both is a must, otherwise you're risking to be hurt with your own weapon...
In my cases, I was lucky enough to have my assailants come to their senses and moved back so no actual use came to play.
With this said, before I started thinking about carrying any kind of weapon, I was stabbed twice with knife, not seriously, but still...
I had the Spartan, and still have the Tanto Voyagers, LX, absolutely favorite knives for work or to carry for self defense.
However, I would prefer to have wave system for opening, combined with a fob, I draw much faster, secure, and my palm positions much faster over the knife controls,
I hardly adjust my grip, something inevitable when you're using folder IMO.
Spartan is a great knife but blade geometry requires some skills, otherwise, the grip is absolutely solid in both directions, stab and slash, and most importantly
the knife comes with ability to be waved off your pocket without any mods.
I still do prefer the Voyager tanto because of the length and geometry of the blade, longer than the clip point, and solid purchase on the grip.
No wave, sadly...
Just for the heck of it I'll slap a picture of what I usually carry, the little Shield with moded 10 rounds mags and choice of waved folders, the last one - Cold Steel ProLite is also waved.
The serrated Voyager, the ZT620 and the Emerson CQC are chisel grind.