I prefer the extended episodes, if only because they are without laugh tracks (if I'm thinking of the right thing). Red Dwarf didn't need a laugh track once it moved past the sitcom format and became a space comedy.
I disagree. Really dry satire and other subtle comedy like Arrested Development & Made in Canada work very well without laugh tracks. However, Red Dwarf, even when they stopped shooting with a studio audience, was always a broad sitcom in the tradition of all great studio sitcoms. Hearing it without a laugh track it just kinda feels dead. It's like watching Star Wars without the John Williams music.