1973-76 - Curity cloth diapers, prefolded, and Gerber plastic pants.
1987 - the same, with two cloth diapers pinned together in a T-shape to fit me. As a young DL I used what was available, and there were still a few of these left in my house, a few years after my younger brother was out of diapers. There was also an open package of Luvs in my parents' closet. We'd never used disposables regularly, I think they had only bought a package or two for use on road trips. I often touched these "luvingly" but was afraid to take one out of the package, so they were never used.
1992 - some baby diaper brand from the convenience store. I was at college, newly moved out of the dorm and into an apartment with two roommates, but we had separate bedrooms, so I was able to make a purchase. I bought some baby diapers (Pampers? Huggies?) at the local convenience store; as I was a regular there I nervously explained to the owner that these were "for my brother's kid", which probably caused more suspicion than if I'd said nothing!
1995 - Depends, Attends, Walgreens and other drugstore brands. Now living on my own, and with a car, I could buy whatever was available locally, and I tried every drugstore brand at one time or another. Most were awful, as you know.
2000 - Tranquility ATN and Molicare (the purple ones). By this time I was becoming aware that diapers could be ordered discreetly online, and I made several purchases from places like HDIS and LLMedico. I ordered some sample packs and tried everything - the Tranquility and Molicare were the clear winners, and I ended up buying some full size packages of these.