For a folder, I would bring my ZT500 MUDD for one reason and one reason alone, SAND. Gets in everything and you do not want sand to jam deployment or lock up when you're gonna need it. I do understand one of the main uses for a blade is utility, not combat, but when I want 100% lock up, I'll take my ZT500 because it has a completely sealed locking mechanism.
For a fixed blade, I would probably bring my Gerber LMF II. I do have more higher end fixed blades, but I can see the LMF II's features (molle sheath with good retention, glass break, serrations) becoming useful.