I never visited the Passaic Book Center, although I wanted to since I lived in New York City at the time, but I used to get their thick typewritten style catalogs regularly throughout the 70's. I remember they put them in different colors, some on blue paper or yellow and had them in separate sections for magazines, BLBs, pulps. Absolutely massive stock of paper material, far more than any dealer had at the time. They had an offshoot store called My Friend's Bookstore on Flatbush Avenue in Brooklyn. That shop was run by Manny and Dottie who were connected with Passaic.
That said, I find golden age stories and art were far superior than about anything that came out in the late 60's and beyond and the new creators are just apeing or refining techniques invented by the old masters. The old books might not look as sophisticated as the multi book epics we're used to now but the artists and writers of yore knew how to tell concise stories with just a few pages and the art had a raw energy that has never been surpassed, pages had more panels and art as well, something unheard of today. Specific books that were better? Hard to narrow such a thing down, but let's say Daredevil Vs Claw stories, Torch and Subby teamup and battle issues, All Winners Squad, early Caps and early Batmans of course, early Superman, All Star JSA epics, pre-code horror, good girl books like Phantom Lady, the list goes on and on.