Thor vs Hal
Thor and Hal swap their respective weapons and spend the next year battling each others enemies and nemesii.
After the year is up they have a brawl
Both at the Peak of their Game
Full Brutality
No BFR/PIS/CIS/CIP
Best of 11 matches
There are no limitations to the more extreme uses of their powers only if you think that they can learn to do them in the time allotted
Also who it's the strongest person that they can defeat with a ring/mjolnir combo