My thoughts are without knowing the extent or actual locations of rust. Offered only as discussion material. Your only question has already been answered.

The area above windshield can be a bit of a challenge to fix. So the question is what exactly is rusted on the 55 bare cab? Sounds like it is just a generic 1/2T. Same cab as a 55.2-59 Chevy. In my world, in the USA, my decision would include which has a VIN matching Title. Which rust is easier and has patch panels available that I could do myself. Avoiding the windshield opening geometry would be a plus.

Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn