It depends on the face. My dad has had a mustache since forever (because I imagine he was alive for forever before I came about.) On the one occasion I remember him shaving it off... well it was just bizarre. It was like someone else's face.

That being said I think most men look best with a mustache/beard combo. A rare man it is that looks good with just a mustache.

btw, were I a male or a sideshow hustling female, I would have the longest beard through sheer will of growth.