Best mechanism on a folder?

Now that I've had my Pro Tech TR-4 (manual) for a few weeks, I have say button lock. It's really smooth, rock solid and just a fun way to unlock the blade.
 
The axis and compression locks I found to be okay but I really prefer the liner lock on the Spydie Military. It's easier to disengage for me and it locks up solid. I'm also one that doesn't really need an uber lock. Simpler is better IMO.
 
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