My favorite multi-tool blade?  Is my old faithful machete.  I do use it to butcher my deer, slice watermelon and canteloup, have carved a turkey with it, chop and split firewood, clear portage trails, flip flapjacks, and lots of other uses.  It is a bit deficient as a screw driver - only works on large slotted screws, and I think it would be just a bit too much work to cut through wire.  Not very good as a plier either. And its not pocket size, but in fact, I have used it a hundred times more often than my gerber or leatherman.