When I was reviewing both rosters, I saw a number of potential opponents for Balor on the Smackdown Live brand. Balor vs Cena, Balor vs Orton, Balor vs Ambrose, but none (except for one later on this list) was more appealing than Balor vs Wyatt. The Demon King vs The Eater of Worlds.
This would be another first time ever dream match, and would be fitting on any of the big four pay-per-views. The hard-hitting style of Wyatt would work well with the technical prowess of Balor, and the bout could be the best of the night no matter what pay-per-view it is on.
Once their singles feud had run its course, Wyatt could call in Luke Harper and Erick Rowan to help, while Balor could form the Balor Club with Gallows and Anderson. An all-out war between these two factions would bring back memories of the Wyatts vs the Shield, and if they were to have a number of high-profile matches, they could even eclipse the Shield vs Wyatts rivalry..
Either way, whether it is Wyatt vs Balor or The Wyatts vs Balor Club, this cross-brand feud would be incredible.