Kennieyk:
Thats a fair question. I'll try to give you an objective opinion here.
I have used many linerlocks, both custom, semi custom as well as regular production knives from many makers over the last 20 years.
With the exception of the smaller knives like the MT mini socom which can be popped with some effort, they pretty much all have the potential for the same presentation speed.
My personal favorites for popping were the tip down linerlocks by MOD, MT, a few Spydies like the military, and some of Allen Elishewitzs'.
If I had to pick one favorite linerlock for defense that was as smooth and fast to open as could be, I couldn't. If I had to pick the top two for me it would be the MODs and MT's, specifically the trident and socom. Thats a personal opinion as I just happen to like those models ergonomics and they are speed demons right from the factory at popping. I really like many more but these would be the best of the best in what I own now.
With tip down and some tweeking at the presentation they [ most linerlocks ]can be out and moving forward to defend as soon as you can put your hand on the knife clipped to the pocket. The knife moves opens and moves forward to defend immediately from the pocket.
I carry front/mid/back locks that are fast but not as fast as the linerlocks or as smooth to the presentation as a rule. Still faster than most with the pop however.
I'll mention the wave here briefly with some thought I have relative Ernies waved knives. I have tried them, very fast at presentation from the clipped pocket.
Opinion on the wave: Not as fast as the pop to defending. The wave needs to move rearward to catch the hook at the back of the pocket. The hand also moves up and rearward in deployment from the pocket initially. Both have to be redirected forward to defending. It takes a split second to do this and I have seen wavers who made it seem they weren't moving in a rearward motion to deploy, they were that fast.
One becomes reliant on the type of blade [ the wave ], for speed and is limited to the waved models Ernie produces. Thats not a bad thing as muscle memory is very important. There is always the chance under stress that the user will miss the back of the pocket and not deploy the blade as well.
A good example of a linerlock that fits everybody's budget is the CRKT. I have tested one, carried another for a few months and they are fast with the pop.
I make that statement only so those here may know it doesn't take a 400.00 folder to be fast on a presentation.
As stated earlier, knives become very personal items with many choices to choose from. What one finds the best, another doesn't like at all.
My only suggestion to you and others would be to handle as many as you can and your hand will tell you which knife feels right for you. If it also has a blade design that suits your needs and fancies, all the better.
Brownie