for me it's a sharp knife
One of the best knives I have has a blade of carbon steel. Blade is only four inches long. It's game not war. Was shrapened up quickly. Cost less than ten dollars. Wasn't made for gutting or working on a deer. Has a wooden handle.
Most hunters/survivalist wouldn't think of using it. A knife sharpener would. And for me, that has made all the difference.