My vote is restoration. These trucks just look so good when they are done up in their original military colors and markings, plus you get huge props driving it around and taking it to shows and parades.
https://i.imgur.com/EjDKsWB.jpg
If you want a cool old truck to daily drive, look at the thousands of Square body Chevys, old Fords and J-trucks that are out there compared to the fact that the M715's are probably in the hundreds that are left. I've said this several time before here if you are looking for a great daily driver to run 70 down the highway, then don't look at a 50 year old military truck. There is no insulation, no sound deadening, and not mater what you do the top will always leak when it rains.