10STRONGER: Goku, Dragon Ball Z
For one thing, Saitama can't really defeat everyone in One-Punch Man. Goku comes from Dragon Ball Z, known for his penchant for fighting. One of the things in the Goku vs Saitama debate is that the latter is a gag character, so it is pointless and it doesn't matter who
he is up against. But truth be told, Saitama did blow away a storm by only punching it, so that's not a reason enough.
Comparatively, Goku's physical feats and abilities are far stronger than Saitama's. He's obliterated the walls of an alternate dimension and shook a universe by just arriving in it.