I have been reading The Pytons: Aurobiography and their is an interesting comment by John Cleese (I believe). He says the Monty Python and the Holy Grail is more popular in the US and The Life of Brian is more popular in the UK. I am not so much concerned about the UK/US dichotomy as opposed to Dopers opinions in general.
Personally, while I think that HG has the funnier bits, I think the LOB is the overall better movie. LOB is much more a properly structured story, it actually is a commentary on something important - organized religon, and it is very funny. HG seems like a loosely connected bunch of sketches. HG seems to be more quotable, but there really isn’t much of a story, which I think is hgihlighted in the way it ends.
LOB has a protagonist who goes through the standard character arc, which creates a more staisfying overall movie.