#2 Roman Reigns wins

A win by Reigns used to be met as unfavorably as a win by John Cena during the height of Cena's dominance in WWE. It was usually a foregone conclusion that both men would win after overcoming the odds to heroically come out on top. With Reigns over the last year, however, they've let others beat him from time to time. Erick Rowan beat him at a PPV in 2019, albeit after help from the former Luke Harper.
Corbin has also defeated Reigns before but nothing was attached to winning that match. As I stated on the first slide, if a title shot is attached to the outcome of a match and the Big Dog is in said match, he usually wins. The Lashley/Reigns fights prior to SummerSlam in 2018 are the main example of that.
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The Big Dog did fall to Corbin at the TLC PPV in December but that was in a TLC match and not a straight-up wrestling contest. When the rules of a normal match apply, Reigns usually wins when big stakes are attached. The feud between the former Universal Champion and Corbin is taking place to hold things over until WrestleMania Season is upon us.
But as we all know, the Royal Rumble kicks off the Road to WrestleMania. I can see a scenario where the feud continues past the Rumble, but it should conclude following it. Reigns winning would seemingly end things as he is still the golden boy and destined for a big match at WrestleMania 36.