It's a close call, but according to Michael Myers and Jason Voorhees are both strong, but Jason had a better chance of survival due to his greater strength and viciousness. Michael was able to stab Jason in the heart, but Jason retaliated with a punch that sent Michael flying. While neither of them has superhuman strength, Jason has been depicted crushing people's heads like watermelons, so this gives him the edge and support the conclusion that Jason is stronger than Michael.