I think Superman 1 million's powers have greater scope than RKT's, from what we've seen.
It's difficult to say what kind of power it took RKT to stop the Ragnarok-cycle permanently though...We know that Odin had no chance, that it's spanned many timelines and universes. The Ones Who Sit Above were powerless to stop him, and they had in turn siphoned off the Rangarok event's power over thousands of years.
Mimir's well also stated that RKT had CLEARLY moved beyond Odin in scope of knowledge and power.
A lot of implied power, but only by virtue of leeching off of Odin's feats 😛