I tested both a 135mm and a 150mm when I was starting to print 4x5 and chose the 150mm. I still have both (why get rid of anything ). I've printed 16x20 with no issues and use a Beseler 45MX. I would suggest finding one that you think you want and print the same neg with both and see which you like. If you want to sell it, you can probably turn the unwanted one around for what you paid if it was used when you bought it.