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I have both. My vote goes to the 950...since getting a 950-1 (black G-10) my 520 hasn't seen a lot of pocket time. This Osborne design is terrific and
one of the smoothest Axis models out there, AND it's much easier on my pockets than the 520 with those ribbed aluminum handle scales.
And where is the hard use?
I consider hard use to a little prying and cutting branches with one or two hits.
Obviously the 520 because of the thicker blade. To me the 14205 comes to mind too. I like the 14205 for its thicker blade and the G10 even more.
I never had a look on the Rift. If the tip is as strong as on the 520 or 14205, the thinner blade might have its advantages to cut branches or that kind with a slash.