Favorites: APBTs, boxers, Rhodesian ridgebacks, JRTs.
Least favorites: don't really have least favorite breeds, more a type: I'm not fond of what I'd consider more "primitive" breeds, some spitz, basenji, shiba inu, and breeds like pharaoh hounds, afghans, etc. not big on shar peis, but I think if I met a bone mouth I'd adore it.
Basically, I don't want a dog that acts like a cat, lol.