I just recently (September) bought my first actual stash of ABDL diapers, before that I would wait until I really really wanted to wear and then I'd just buy a pack of Depends.
I couldn't decide what to get at first, so I got a full mixed case from ABU; Space, Peekabu, SDK, Cushies, Preschool Cloth Backed, Simple Ultra, LittlePawz, and Kiddo. Over Black Friday I ordered a half-case with Space, Peekabu, Dinorawrz, and Barebums.
I don't wear super often, so I still have quite a few of each in the closet. PeekAbu and Dinorawrz are my favorites so far though. I realized pretty quickly I like four tapes way better than 2.