I’m a big fan of all the monsters because I’m a monsterologist but here’s how I rank these
The most handsome: Godzilla
The most ugly: Bat-Rat-Spider from the angry red planet
The most aggressive: ghidorah
The most swift one: xenomorph
The stinkiest: King Kong if he doesn’t take baths
The most beautiful: You know who 😏
The least popular: either Rhedosaurus or Gogola.