The Ratte is better.
The Ratte was to be a nightmare machine and its scale still boggles the mind. It would have been 35 meters long, almost four times as wide as the Maus, and 11 meters high. Armor would have been similar or possibly slightly thicker than that seen on the Maus, but of course covering much more surface area. The tank would have been propelled along on a total of six 1.2 meter wide tread assemblies, three on each side of the tank. This means that the treads on one side would have been only slightly narrower than the entirety of a Maus. No less than eight Daimler E-boat engines would have provided the tank's requisite 16,000 horsepower and the turret would have literally been a Graf Spee class battleship turret with only two instead of three gun positions.
If your pants aren't feeling uncomfortably tight yet, just wait until you hear about the armament. The turret would have mounted a pair of 280mm long barreled ship cannons, each gun weighing in at almost 50 tons and firing shells that weighed over 300 kg a piece and were capable of reaching out and touching someone 42 kilometers away. Practically these weapons would have never been able to engage targets 42 kilometers away in a direct fire role, but that was their naval capability. Finally, instead of a turret machinegun the P.1000 was intended to mount either a dual or quad 20mm anti-aircraft gun on top of the 380 ton turret. The number of crew members is unknown but would have likely topped fifty men, with adequate machineguns studding the hull to engage infantry from all directions.
