Godzilla (GXM):

• Height: 180 ft / 55 m

• Length: 401 ft / 122.5 m

• Mass: 25 000 t

• Powers: Amphibiousness, Atomic Breath (doesn't one shot his opponent), Durability, Extraordinary Jumper, Physical Strength, Powerful Jaws, Prehensile Tail, Sharp Claws and Teeth

• Weaknesses: Poorly reacts to faster opponents

Mechagodzilla (GVMG):

• Height: 164 ft / 50 m

• Length: N/A

• Mass: 40 000 t

• Powers/Weapons: 360° Head Rotation, Arm Rotation, Cross Attack Beam, Defense Neo Barrier, Mach 5 Flight, Missile Launchers, Space Lasers, Space Titanium Armor, Super Radar

• Weaknesses: Decapitation

Assuming G2000's atomic breath won't blow up Mechagodzilla in one shot, who will win?