First of all you seem to have thrown the "Wet Road" part in after the fact there bud but in the simplest terms I can muster for you , Braking is friction . Maximum friction equals maximum braking equals shortest stopping distance, all 4 locked up is maximum friction . ABS pulses the brakes allowing the wheel to continue rolling which provides better steering control while braking but lengthens the actual stopping distance . It's physics , threshold braking is also better than mechanically pulsing the brakes .Hydroplaning is not a given on wet roads , it is generally caused by the tire not being suitable for the conditions either by design , compound or pressure , I run the Nitto NT555R which is a wet rated and highway rated "Drag Radial" , I have been in torrential rains where I could barely make out the shape and lights of the semi in front of me without even a hint of hydroplaning but this has nothing to do with the myth that ABS stops better .