I find the axis to be the best. In order to open or close the knife you never have to put your fingers in front of the blade. (which is how many a cut takes place on liner, lockbacks, ect) Another problem I have seen with liner locks is with a tight grip and the right motion you can unlock a liner lock during use. Also, Liner locks need to be made to tight tolerances to be effective, an axis will lock even if badly worn. If I had to choose a best lock the axis is it. (for me atleast, many on knife forums seem to agree the two best folding knife locks are frame locks and axis locks) Now, if you really want the absolute best lock on something that folds a butterfly knife is it. Unless you break a pin it works like a fixed blade and won't fold on your fingers. However, these are not always legal and are generally frowned upon by LE.