Spiral vs Bound, Horizontal vs Vertical

What is your favourite sketchbook format and binding? Links to more details on the sketches in these books: Volume 156: 7x10" Stillman and Birn Spiral Alpha - https://www.lizsteel.com/tag/vol156/ Volume 157: 10x7" Stillman and Birn Spiral Alpha - https://www.lizsteel.com/tag/vol157/ Volume 158: 8x10" Stillman and Birn Softcover bound Alpha - https://www.lizsteel.com/tag/vol158/ Tips for sketching windows and glass - https://www.lizsteel.com/windows-and-... More about my courses Foundations and Sketchbook Design here: https://sketchingnow.com/