If you want to save the brakes you should use the autobrake .It was demonstrated that the use of autobrake,setting 1 or more ,till 80 kt will reduce brake wear
Maybe so,especially with carbon brakes. Historically it is a different story though. Shortly after the 737 was introduced into service around 1972 (?) Boeing conducted periodical Boeing 737 Operator Symposiums. Some operators complained that wear and tear on tyres and brakes had increased significantly with use of the auto-brake system. This was despite Boeing assertion in the then FCTM that wear and tear would be reduced with aauto brake use.
Boeing explained to delegates at the Symposium that the advantage of autobrakes in a fleet of Boeings was that wear on the wheels and brakes would become more uniform and thus maintenance times of these units more predictable. The point being that pilots have differing braking cultures - some are lead footed and stamp on the brakes early and hard while others wait for the effect of reverse thrust to slow down the aircraft before applying brakes toward the end of the landing run. Thus maintenance periods on brakes and tyres depended largely on pilot technique and was difficult to plan on.
Boeing went on to say that autobrakes were designed to aid in stopping the aircraft and as the brakes were applied immediately on wheel spin up before reverse could build up, naturally there would be faster wear and tear and hotter brakes would result.
The B737 FCTM states "Boeing recommends that whenever runway limited, using higher than normal approach speeds, landing on slippery runways or landing in a crosswind, the autobrake system be used".
This suggests there is no operational requirement to switch on the autobrake system unless one or more of these parameters are present. To actuate the autobrake system for all landings regardless of excessive runway length is operator choice, but expect more wear and tear on the brakes and tyres.