#1 An AJ Styles & Daniel Bryan-type match-up
If you go back to Lesnar's best matches in the last few years, two, in particular, stand out: The one against AJ Styles at Survivor Series 2017, and the one against Daniel Bryan the next year at Survivor Series.
Both matches had similarities, in the sense that they were both champion vs champion matches. While a large part of the matches saw Lesnar rag-dolling them, Bryan and Styles were able to get a lot more offence in and Lesnar sold like death for them.
The matches were also longer than the usual Lesnar match, and the "smaller" superstars were made to look very strong in defeat. This is likely what's going to happen between Lesnar and Balor.
Since the PPV is long, they'll have time, and Balor will be rag-dolled for a large chunk of the match. However, he will be able to get his offence in and even if he does lose, he'll look great even in defeat.