Full manual application provides more pressure, with a full duty cycle (provided anti-skid is not triggered) to the wheels on aircraft I know of with Autobrakes by design, therefore the DRY decel rate would be higher, Mr. Cat.
From that I am taking it that on a wet runway max auto is more than max manual....
That may or may not be so. I've been told the computer is better at stopping on WET runways due to the decel calibration being better than that on your average set of 10 toes.