Strength of specific locks depends not only on the materials/build quality, but also depends on what you're doing with the blade. Being able to hang hundreds of pounds of force on a knife trying to close it doesn't mean all that much if you never plan exerting that much force in that direction. Pressure in the opposite direction (ie: cutting stuff) can cause a liner/framelock to engage further down the blade, which causes more wear.
Durability of a lock is also a factor. Liner and framelocks will all eventually wear and make the lock more suspect. Same with a lockback, although wear depends more on quality than usage. The AXIS lock has no difference with wear because of its design. The weak point of the AXIS is obviously the omega springs, but since there's 2, a broken spring won't cause a failure of the lock.
Daily use is also a factor of lock strength. The most likely cause of failure of a lockback is a buildup of crud in the part of the blade where the lock engages. Dust, gunk, pocket lint, etc. Liner and framelocks are significantly less positively locked if there's a bit of side-to-side blade wiggle, which can occur from the pivot loosening from daily use.
Because of all these factors, I would personally say that the safest lock for daily use is the AXIS lock. It won't fail because it wore out, got gunked up, or because the pivot needs tightening a bit. Followed by the plunge lock (mainly on automatics), compression lock, lockback, framelock, and linerlock, in that order. I don't know much about the Triad lock, so I'm not sure where that would place.
Of course, a balisong trumps all of these, but that's comparing an M1 Abrams to 4x4s.
