The Best Invasion from Outer Space Movies of the Fifties

The War of the Worlds (1953)

https://moviechat.org/tt0046534/The-War-of-the-Worlds

Earth vs. the Flying Saucers (1955)

https://moviechat.org/tt0049169/Earth-vs-the-Flying-Saucers

The Mysterians (1957)

https://moviechat.org/tt0050251/The-Mysterians

Battle in Outer Space (1959)

https://moviechat.org/tt0053388/Battle-in-Outer-Space

And I don't think anyone should choose a favorite one until they see all of them. I find it hard to choose a favorite.