2. The Xenomorph
Project: Aliens vs. Predator franchise
"*inaudible alien noise*" -Xenomorph
The Xenomorph always beat the Yautja. Even in the flashbacks (Alien vs. Predator), they had to blow themselves up to defeat the Xenomorphs. It could be that they don't have a particular fighting style. That makes it difficult for the Predators to predict their movements. That and the Xenomorphs are quick despite their size.
Since the Predators don’t take losing lightly, they continue to try again. Whenever they do win it’s with with the help of a human. It should make them their greatest enemy, but Arnold has to be number one.
"You're one... *ugly* mother(censored)!" -Dutch
Dutch expected to do a job with his team and leave alive. Instead, they're attacked by an unknown killer. As the movie progresses, the killer slaughters them one by one. Eventually, they find out it's an alien we now know as the Yautja and Dutch is the only one who survives.
Dutch’s victory comes after having no time to plan. The other people on this list at least had some. Dutch made traps in the jungle with nothing but a blade and his wits. He was lucky he discovered he was untraceable while covered in mud. Even then he almost died when the mud washed off.
Quickly put, Dutch is the innovator and Arnold Schwarzenegger's performance is the reason Predator is a profitable franchise.