My favorite, and the best I have used for field dressing deer, is the Randall #11 Alaskan.
Last season, I used a Cold Steel All Terrain hunter. The carbon steel, leaf shaped blade is a wonder. That cheap and that good.........wow.
another really good one is my Brusletto from Norway, blade like a fat razorblade, and only two inches long. Quiete effective.
For squirrel and other small game, the best I have ever found is a Henkle kitchen knife, the 2.75 inch kitchen trimming knife. my leather guy made me a little sheath for it, and let me tell you, this fellow will WORK. Forged high carbon stainless, holds a razor edge, and is shaped just right for dressing rabbits and squirrel.
another great skinner is the old Clauss 4.75 curved blade, sharp along the first two inches of the upper side too. Leather washer hilt, aluminum pommel, serrated along the top edge forward of the hilt......... what a fine knife. A posthoumous gift from my hunting mentor, Rev. Lee, of Jacksonville Fl. I have used this knife for over 40 years now.