Mutts to You/Flat Foot Stooges - These seem to be the Charley Chase directed films that get the worst rap, but I honestly don't have a problem with either.
Booty and the Beast - The safecracking scene was an improvement on Hold That Lion's opening scene in the office, so I tend to prefer this over the original 1947 short.
Hoofs and Goofs/Horsing Around - Often cited as the worst Joe B efforts, but I'd reserve that spot for the laziest of remakes like Pies and Guys or Triple Crossed. I dunno, maybe I just enjoy these in a "so ridiculous, they're good" kinda way.