At the risk of a thread hijack...
SARG: I use a Fobus or Blackhawk Serpa holster on my hip, the theory being that what if I encounter something while off the tractor? Get off to trim a fallen tree back, am 20 yards from the tractor, and a target shows itself at that point. Most of my issues have been raccoons and opossum in the trash or animal food as I walk to/into the barn.
I encourage you to keep it on your person, but will agree that on the tractor is closer than back at the house.
My go-to is a little Walther P22, it's showing the signs of holster wear, but functions just fine. I'm most accurate with it, and due to how much a 9mm can go thru, (having shot coons inside the barn) the .22 is a nice compromise.