I use Rodinal (Adonal) or HC-110 for just about everything because they last forever, are quite inexpensive and work for all my films.

I also use Kodak D76 from time to time, primarily with the Plus-X (and Arista Premium 100) I still have around the place.

I have some Microphen that I have used for D3200 but I think I don't think I'll buy anymore when this batch is finished.

Lately I have been doing some color developing so I am also using Unicolor c-41 kits.

I guess I have to check more than four.