Aliens vs Aliens
The aliens from Independence Day seek out a new world to drain of its natural resources. After searching through endless solar systems, they come upon the home world of the aliens from War of the Worlds.
The ID aliens detach 15 city sized ships from the mother ship and begin entering the planet's atmosphere. The War of the Worlds aliens begin manning hundreds of Tripods to prepare for battle.
With no computer viruses to cripple the ID aliens...and no diseases or bacteria to harm either alien species...who do you see winning this war?