I don’t have a favorite but a few I liked a lot.

The Adventures of Buckaroo Banzai Across the 8th Dimension: great fun crazy cast.

Cirque du Freak: The Vampire’s Assistant. Such a strange world. I would have loved to see sequels.

Pandorum: Clever scifi horror. Unique situation and setting.

Rustlers Rhapsody: The main character is a genre savvy singing cowboy from 1940s westerns transported to a 1980s western. The bad guys have to team up with some spaghetti western villains.