On one side is a crypto muslim GOAT who could put his 92kg into 70 so he could beat rank squat bros Gaetje and Porier. Actual list of his wins is huge, but people on the list wouldn't fight same people inside years and lose to featherweights, so their part-time mma resumes aren't that hyped or interesting.
On the other side is a fucking bum who fought professionally only for 20 years, half of the term being a champion, fought 4 generations of fighters and holds some shitty mma records.
If you are still struggling to get who is the GOAT, the defining point is a win against Conor McFraudor.