Tough question for sure. I am not sure that I have a "favorite", but several favorites.
Top Water, Larry Dahlberg's Whopper Plopper.
Top Water or slow sinking, a glide bait.
Larry Dahlberg Mr. Wiggly soft plastic.
Spinner, the Double Cow Girl.
Swimbait style, a big bait like the Boot Tail lures.
I don't get to fish for Muskie, or Tiger Muskie, often anymore, but the above were my my go to lures. I believe that improving any of them would be right on track.