I wanted to be clear that what I was saying is my opinion. My opinion on the three knives I named is based on actually owning and using these knives over time. I've seen several liner locks fail spine whack tests, and to me that make the knife unexceptable for self defense or any type of stabbing at all. The knives I listed I've owned and used and never experienced any lock problems. There are hard parts (bones) all over the human body. Perhaps the single greatest problem with carrying a folder for sd is that it folds. To have the strongest lock possible seems very logical to me for that reason. Sure a liner lock may be fine, but to me it's a chance I don't want to take regardless if I'm chipping bark off a tree, or especailly if I may consider using a knife for defense.
I feel the three knives I listed are the best knives because, in my opinion, they offer the best combination of lock strenth, handle grip, and can be used for cutting of stabbing without limitation. Are there better knives? Probably, but not that I've owned of handle or used. I would fully trust any of the three with my life, and fingers.
Also, I feel that in general frame locks are the most reliable locks there are, due to the fact that if your holding it, there is almost no chance of the lock disengaging, where as a liner lock can simply slip off the tang reguardless of how thick the liner may or may not be. If you feel good about a liner lock that's fine, but I believe there are better choices. Any knife is better than none, but If you want "the best", I don't think a liner lock fits the bill. I also believe that a knife that's just a small amount superior is worth having.