I do a lot of stuff for repro. An excellent neg scan is often best, but you have to have a decent scanner and then replicate your burns and dodges, takes a bunch of work. Scans from prints work well too, and you don't have to recreate your darkroom efforts. Glossy surface is best, makes no difference if RC or fiber, but RC will lay flatter and that is an advantage for the scanner.

I think what John is saying is scan deep, (high pixel depth, RGB 16 bit or the best the scanner can do) then match it to look like your print. "rz" or res, or alter the final resolution to match the specs. Scan at a higher resolution at or above the final output size. It's best to work close to 100%, if the print is a bit bigger than your final output that's good, if much smaller, not so good.