I use film scanner to check my B&W negatives before printing. It saves a lot of time and money (paper, developer etc.) as I only print those negatives that are worth to print. I can check if they are exposed well before printing etc. I am still using an old 1800 dpi scanner but want to upgrade soon.
Scanning a print in my opinion might be much more available for most people as the flatbed scanners are readily available as priter/scanner combos and can be found in more households. IMHO only those bother buying a film scanner who are determined and want better quality. Scanning a print might involve more loss to image quality as it has an extra step between negative (the raw file of analogue
)) and scan (negative - print - scan). This is only some thought on the topic, not out of experience.