Norse Gods win. Not a stomp compared to the Greeks (Greeks are the worst Gods ever that even Mortals can trick them). From what I know, here is where I rank the gods (polytheistic only):
1. Norse Gods
2. Hindu Gods
TIE: 3. Egyptian Gods & Roman Gods
4. Greek Gods
Not because the Greeks have higher numbers they guarantee themselves a victory. The Greek Gods and the Titans both SUCK. Mortals can kill the Greeks.
Egyptian Gods are truly immortal cause they cannot be tricked by mortals. Even Thoth who wrote the Book of Thoth was powerful. Telling a Greek God to read the book of Thoth is like giving a Greek God an Elder Scroll. The outcome is the Greek God DIES by reading one or the other.
Norse kick everybody's ass. They have Odin the Allfather and has more power than Any Polytheistic God, Thor the God of Thunder, Loki, Giants, Demons, Surtur, Valkyries, and other amazing stuff.
To conclude my comment. Norse Gods win, Egyptian comes in second (since Hindus were not discussed in the forum), and Greeks well they suck and are the worst.