Er, um... any/all of them?
Some days, out and about, I’ve used every tool on my SwissChamp/Rebar/Center-Drive. Then again, if I’m home, I’m near one of several tool boxes, and I might use none of them.
When I pick the multi-tool/knife combination to carry on a given day, I usually think about what implements I’m most likely to use, and how much of a hodcarrier I want to be.