It’s quite easy for me: anything Dragon Ball related before Super started. DB/DBZ/DBGT were my childhood and even when it wasn’t exactly on my radar later on in life, I never stopped wishing for just one more new story, one more fresh entry, one more adventure for Goku and the gang. And as much backlash as Super is getting for various reasons, at least it scratches that itch.
(The question came to my mind because my allergies totally K.O.'d me over the last few days, so I didn’t find the energy to keep up with the daily question posts.)
I never watched the full series of DBZ. But I remember watching the Cell Arc before school years ago. I wouldn’t watch any other DB apart from DBZ.