Day to day, usually a classic old-school original style Leatherman, a Victorinox SAK Explorer (first because it was a gift from my much admired MIL, second, because the magnifier is SO handy!), and a little Old Timer 104OT, that is sharpened and stropped for use as a general purpose surgical tool when working on a sheep or whatever else needs a delicate touch. Pocket time aids in making it sterile enough to cut apples with, eh? So, normally, I have at least three choices for tools to suit the purpose.
Got tired of losing sheath knives out in the hay fields, so have been using Gerber Airfoil folders in addition to the rest, when I need a one hand knife during hay season or whatever. Takes only a few minutes to adjust the mechanism and lube it up so a flick across the opening stud, with a thumbnail, or the correct flick of a wrist, will snap it open. And, cheap!