I think THE NAUGHTY NINETIES is one of their best films, with a lot of great routines packed into it. This film is often underrated. My "Top Ten" would go something like this:

A&C MEET FRANKENSTEIN
THE NAUGHTY NINETIES
WHO DONE IT?
HOLD THAT GHOST
BUCK PRIVATES
IN SOCIETY
WISTFUL WIDOW OF WAGON GAP
PARDON MY SARONG
THE TIME OF THEIR LIVES
LITTLE GIANT


THere are good bits in most of their films; the problem for me is the intrusive musical numbers, which are of varying quality.