I am curious.
I like open forms (bowls and vases) so that is what I usually make.
I like seeing the inside of the piece and I carry some of my designs through to the inside. Sometimes the inside can be different from the outside and I like the contrast of that. I also find my audience understands a bowl and sometimes asks "what is that" to the hollow form. I do make both, but usually it's a bowl
Some people make primarily hollow forms.
What do you prefer, and why?