I would suggest a red dot, maybe an Aimpoint red dot. The make a 2x red dot which you can leave on all day long without fear of the battery dying. That would be ideal IMHO. A variable scope requires someone to turn it to use it. When I have been in shotgun territory, the shooting was fast and furious. It was all 75 yards or less.

For cheaper, you could get a fixed 4x scope without illumination, if most of your shooting is over 50 yards.