Who would win monsters or aliens?

Answer 1

=It's about a girl named Susan Murphy who was getting married to this guy when a meteor hit her. This made her grow super-size (49 ft. 11 in. tall) and the government took her to a secret facility for monsters. There, she meets B.O.B, an indestructible gelatinous mass, The Missing Link, a fish-ape thing from the Ice Age, and Dr.Cockroach, who was a mad scientist and when one of his experiments went wrong, his head was replaced with a cockroach head, and Insectasourus, a huge grub that makes Susan look small. When an alien lands in America, they release the monsters to kill the aliens. The aliens leader, Gallaxhar, wants to take over the Earth.==So, it's up to them to save the world.==Oh no...=

Answer 2

Anything could happen really, but aliens have more technology and are typically smarter than monsters. But then again, monsters could just use their brute forse to win.