I am not able to evaluate the potential print quality from a negative so I have always made contact sheets. In the old days I made them in the darkroom. A number of years ago I switched to digital contact sheets. With ULF negatives I shoot them over a light box with a digital camera, one at a time. With MF and 5X7 film I put the negatives in Print File pages and scan the pages, at 600 dpi. I save these pages just as one would save a printed contact sheet. If I want to evaluate the potential of any given negative I open the page in Photoshop, select the image to be evaluated, and apply various tonal corrections to see how it will print. I find this procedure saves much time over making contact prints in the darkroom, and also gives me a lot more information to work with in evaluating how to best print the negative.