Why would you not take it that max manual is also greater than max auto on a wet runway?
From an engineering perspective... Autobrakes give you a fixed deceleration schedule*. If you add reversers and speedbrakes into the mix, you still get the same deceleration rates (although with less work for the brakes). Manual braking gives you maximum braking plus you have extra deceleration c/o reversers and speedbrakes. Manual braking is similar to RTO braking.
*assuming there is not too much intervention by torque-limiting/antiskid/anti-aquaplane circuits.