I agree that the Greek gods are more powerful due to the sheer variety of their abilities, but heavy hitters like Thor, Odin, or Baldur are nothing to scoff at.
Agreed and fair. I think it most cases, Greek gods are more powerful in their innate abilities and magic, as you stated, whereas Norse gods are a bit stronger physically. In terms of the games themselves, it would indeed be a closer battle between the two pantheons.
A GOW fight between Zeus and Thor, or hell,
Ares vs Thor, for example, would be insanely cool to see.