Currently I have 4 shelves of MOTUC, one shelf of Vintage, and one shelf of 200x. So really it's a mix, but MOTUC clearly has precidence.
That being said, before I got into the position I find myself in, when I had my own living space, I had everything displayed everywhere. And for some reason though the MOTUC clearly had the prime choice display space, and were clearly the heart and favourite of my collection, Transformers actually had the most space alloted to them. Mostly based on size.
If you considered cross property displays, my biggest was actually Horror related figures and memorabilia.
BUt MOTUC Is my primary fandom in my heart right now. He-Man was always my favourite toyline. Classics deserves to be in the center of it all.