Well my favorite is a any good breakfast sandwich from a nice resturaunt, egg, cheese and bacon on a nice toasted hard roll.
As far as fast food joints go I prefer the bagel sandwiches, then the english muffin, then crossiant, then buscuit.

I love buscuits though, just I don't prefer them for a sandwich, they are a little too brittle for a sandwich.

Pillsbury toaster scrambles are awesome too!

My favorite breakfast dish is not a sandwich, it is sausage buscuits & gravy!!!!