I find swiss army knives to be extraneous and totally useless.
I do carry two pocket knives on a daily basis. I carry a
kershaw, specifically the non-serrated version of
this knife , and I carry a fully serrated
spyderco .
Why? Mainly because knives are so damn useful on a daily basis. I carry the fully serrated knife just in case I ever end up having to cut through a seatbelt or something similar. And, uh, because my Glock can't cut things...