I did an analysis many years ago on this exact question. The brake wear is a negligible item as the brakes, while expensive, last a very long time. There is some reduction in flap drive wear costs associated with Config.3 landings. The kicker is the tire costs - 10% greater than with a Config. Full landing. Back then, the tire wear was the same as the fuel saving. With the low cost of fuel now I would be pretty certain that it costs more overall to land Config. 3 than Config Full. YMMV.