{Question} Planners and Organizers for Writers: Yes or No?

I’ve been looking into buying a new planner, since my old one died at the first of August and it’s something I need. However, I’ve been having a hard time finding one I like and I’m curious to know:

How many of you are using day planners?

What are your favorite formats? Monthly? Weekly? Daily? Horizontal or vertical?

What do you look for when you choose a day planner?