Guess you can call me cheap, but my go-to knife for cleaning squirrels and bunnies is a 4" Rapala fillet knife. Good for skinning and deboning. Game shears then make quick work of cutting off the feet and head.
I believe smart it the word you are looking for. I could clean a squirrel with a flint.
I also like a Fillet knife for Squirrels!
Have used several different kinds of knives, for them, but I always seem to wind up with a fillet
Knife in my hand!