Smackdown should win the RR again IMO. Reigns vs Brock is obvious enough to happen, and you don't need to waste yet ANOTHER RR win on Roman just to piss fans off and set that match up when Big Dog can just walk out to the ring and ask for Brock.
We have enough time for Jinder to drop the belt to AJ for his 2nd run and then set up Nak to win at Mania.
If you're gonna have Raw win, give it to Finn or Miz. Only thing is with Brock as champion only like 2 people are capable of taking that man down, so if he's champ by Rumble nobody on Raw is believable to beat him.