Both good glass (I have them, too). I'd stick with the APO if it seems clear and solid. These are known to be best performing at relatively open apertures and I use mine at 5.6 mostly as with my equipment and materials, it gives me about the right exposure times, allowing for some dodging/burning. You will have very little depth of field forgiveness at open apertures, so aligning your enlarger becomes doubly important for extracting what that good APO lens can deliver.