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I think its 50% preference and 50% purpose.
I spend a lot of my time either fishing or hunting and usually my pocket knife is this or something very close to this. Currently I use a S&W Tanto folding knife. Its cheap enough to where if I should drop it and lose it, its no big deal (only out $20) but stays sharp and is used everyday. Even when I am working (plumber here) my pocket knife does a LOT of work for me. If not my knife, then definitely my Gerber Multi Tool.... Now THAT is a REAL 'must have' to carry everywhere.