I carry a TDI Knife made by Ka-Bar. Since it's a defensive knife, I prefer a fixed blade. It's light weight. Easy to draw. Ambidextrous. Strong. Sharp. Light. And inexpensive. Sure it's not a Randall, but I carry for real. If I drawing a knife, I either fighting off a gun-grab or on the ground. EIther way, time is of the essence.
Also....I am used to always having it. So it does see duty as a utility knife, window-pryer, rope cutter, etc. Keeps me used to drawing it instinctively. And should it break (I have never broken one in roughly a decade), or be lost, it's 30 bucks to replace.
Truth be told, I am not a "knife guy", but I certainly know how to fight with one.
My point is, sometimes the best gear isn't the cool gear.
TTR