I will give a real situation since this probably depends on it. I make 3 farms before feudal and 12 wood choppers, and a total of 18 farms in feudal with 12-13 wood choppers. If I can only get one upgrade, which is the most efficient? I get the other upgrade while going to castle. People say that Double-Bit Axe is the most efficient upgrade for feudal, but my instinct is telling me horse collar will save me more wood.