What would have the least friction with wood?

Your question leaves allot to be desired. Are you going with the grain, or against the grain? What type of wood are you using? What purpose are you using it for? Different types of wood have different properties. Here's one way to look at it. Plastic has A lower melting temperature than aluminum foil. Friction causes heat. Test your question. Wrap A piece of wood in aluminum foil, and another in plastic wrap. Slide them down A ramp. Then check your results. There would be your answer.