Douglas Bailey
Second Unit
I split by format (DVD, Blu-ray/4K) purely because my Blu-ray shelves have tighter spacing for the shorter cases. Within each format, I shelve purely alphabetically, with only a few very local overrides for series order (e.g., Alien, Aliens, Alien³, Alien Resurrection). Numbers get shelved in spelled-out form, so 2001: A Space Odyssey files under "T", and I ignore articles and non-fictional possessives, so Das Boot files under "B" and National Lampoon's Vacation files under "V" (but Monty Python's Flying Circus files under "M").