Thank you to everyone who voted in my poll, which I did out of sheer curiosity. You can see the results in the sidebar.
I wasn't surprised to see that most people use a Personal size insert, and most people use Week on Two Pages.
I was surprised that more people don't use the week + notes format, because in bound planners this format is so extremely popular. My own personal opinion is maybe people don't use the Filofax version more because of the multi-languages! In my experience they take up too much day space.
I didn't do a breakdown to see how many people use, for example, an A5 week on 2 pages vs. a Personal size week on 2 pgs because I thought that would make the poll too complicated.
I love learning about how people use their planners so I found this poll fascinating! Thanks again to everyone who voted.