If we’re keeping it strictly ‘80s and being real then the answer leans heavily toward Arnold. Now don’t get it twisted, Rocky IV was a cultural bomb drop, no doubt. But take that one movie off Sly’s list? Suddenly his filmography looking like a bunch of gym montages and bandana cosplay held together by grunts and explosions.
Let’s talk impact: Arnold dropped The Terminator, Predator, Commando, Conan the Barbarian, and The Running Man all in the same damn decade. That’s sci-fi and action domination, and memeable one-liners for life all at once. Sly? You got Rocky III, Rocky IV, First Blood, and then... Cobra and Over the Top? Breh was out here arm wrestling for child custody like that belonged in the same tier as Skynet and Dutch vs. Predator.
Bottom line: Without Rocky IV to carry, Sly’s ‘80s catalog starts looking more like late-night filler, while Arnold was printing out box office hits and redefining the genre. One was building a cinematic legacy. The other was trying to sell America on Rambo sequels and fingerless gloves.