My Emerson COmmander, without a doubt. And not just with the wave.
Held closed in my hand, I can open it faster than any other, and drawing it "waveless" and opening, the same is true.
Its very smooth, and the arc in which the thumb disk and thumb moves is perfect for me. Othe rknives, because of the angle/radius/whatever of that curve, my thumb has to change position a little during the push to open, with the Commander, that doesnt happen, its the same radius my thumb move sin naturally, its awesome.
With the Wave, its faster yet. I am familiar enough with the wave, that using it is effortless, and is generall 100% effective. Only once in recent memory has it not fully opened when I waved it, and that was my fault, not a lack of effectiveness on the part of the knife.
If you turn it sideways intot he side of your pocket, you can draw straight up, and it will wave. You DO NOT need to jerk it backwards to make it wave.
Wasnt the Wave enlarged a little on the newest generation of COmmanders? I think if it was that might make it even better. But like I said, I rely on mine and have utmost confidence in it.
I think as a defensive folder, you cant go wrong with a Waved Emerson... I dont think there is any exception to that. Because of the wave, you can replace a need for fine motor skill, with a need for only the more gross mucle movement of pulling it out of your pocket, to get it open. I think that makes it all very worth it.
And hey, its damnded impressive too... I'm always showing people, and always making them impressed by it.