Your definition includes two separate things and they are not necessarily related.

Lock strength is one thing, the "safe, solid lock" part We generally use that term to denote resistance to the lock unlatching or failing when in normal use and perhaps when abused. After all, that's the whole point of having a locking blade. Of course, any lock will eventually fail and all have various failure modes. Like all things in knife design, they represent a compromise. Properly designed, and all other things being equal, there's little question that a butterfly (balisong) style design is the inherently strongest folding blade design. It has other issues that make it less than desirable in many cases, including legal concerns in some areas.

Strength while prying is a different thing entirely and not necessarily related to lock strength. This is where thicker blade steel, and the type and treatment of the steel, along with perhaps heavier and perhaps stiffer frame pieces and the pivot design all have much more influence.

That added prying strength will necessarily work against other useful attributes, such as slicing capability, what most use a knife for primarily. Thicker either requires use of a hollow grind to gain back some slicing ease or you are stuck with a geometry that is not optimized for slicing and cutting.

Just a few thoughts on the subject.