I would go with the Endura, for three reasons: cost, weight, speed.
First, it's cheap. Cheapest of the three knives. If you lose it, break it or drop it - just shrug it off and get another one. You do NOT want "Oh, crap, I just dropped a $900 custom knife, what if it chips!" thought in your head in an SD situation. Heck, have TWO Enduras, or an Endura and a Delica. Consider a scenario where your Endura is clipped to your right-front pocket but your right arm is pinned and you can't quite reach it with the left - having a backup Delica in your left hip pocket (I'm wearing cargo shorts right now) would be handy indeed.
Second, it's lighter than the other two knives. The lighter and more unobtrusive it is, the more likely you are to have it on you. This is a sad fact of life. You know what my chances are of leaving my house without my Spyderco Ladybug? Near zero, it's attached to my house keys. Same principle applies to the Endura, just grabbing it and dropping it into the pocket of your pajama pants while stepping outside to take the garbage to the curb at 5AM may mean the difference between having it on you when you need it and not having it. Why might you hesitate to drop say a ZT0300 into your pajama pants? Too heavy, gets in the way, pulls pants down, distracting, etc.
Third, speed of deployment. I'm sorry, but I truly believe Endura w/Wave can be presented and ready far faster than the other two knives with equivalent training. With the other two knives, you need to draw and either index the thumbstud and open, or flick. With a wave knife, all you do is pull the knife out, and it's good to go.
Don't get me wrong, I think BM710 is a good choice too. I find the scales on the handle are more than grippy enough, and keep in mind that the top and the bottom of the handle where it flares out near the blade have teeth on it for a very secure grip, I don't think the grip I can get on 710 is in any way inferior to the grip I can get on the Endura. The Endura will have a bigger thumbrest, but the 710 will have very positive traction with both my thumb and my index finger.
The Recon 1 I have least experience with, just had one for about a week. Handle shape wasn't memorable, it was thicker and heavier, didn't really leave a positive impression with me.
Based on that, my vote is for Endura, or Endura + Delica instead of BM710 or Recon 1.