1. Goku almost died of heart disease, and other Saiyans die from holes through the chest, so it's pretty obvious that the devouring power of the Blade of Olympus would destroy him.
2. While Goku is far faster, Kratos would still be stronger.
3. Goku's Ki attacks are powerful, but the Golden Fleece would easily deflect any beams sent its way, as it can even reflect the Blade of Olympus. It was only destroyed by Zeus because he is the king of Olympus, and Olympus created it, along with all of Kratos' weapons, other than the Blades of Exile, which is why they are the only weapon that survived.
4. Goku is a predictable fighter, whereas while Kratos is immobile, he is a very unpredictable warrior, using any weapon available to him, and proving very difficult to predict. His finishing moves often keep even the player guessing.
Got this from a story. Here's the link: