Personally, I scan the original film, whether pos or neg, rather than a print unless the original film is lost or more damaged than the print. As a rule, this will result in the best digital copy. I currently use, and am quite satisfied with, an EPSON v700. I've used for everything from 16mm sub-miniature through 4x5 and 3-1/2x5-1/4 film (color positive, color negative, B&W negative) and prints of various sizes in both color and B&W.
True, scanning a print replicates any darkroom manipulation that would be present in only the print. For many libraries and other archives, scanning the artists handmade print is important. Often, though, they will also scan the original film if available. To quote Ansel Adams (loosely): the film is like a musical score, and a print is a performance.