With scanning, the conventional wisdom has been, "how many steps removed from the original scene is your image?". In dealing with color separations years ago, this was one of the debates with the original digital SLRs like my old Canon 1D. The feeling was, because we were going from an already digitalized image, the 1D produced better results at times than negatives (one used to have to create a print from negs, then scan that). So, the order of preference from pre-press houses was digital->transparency->neg/print.
The same holds true now. Scan your neg, if you have a suitable scanner. Scan the print if you have no neg available.