I think Calvin Kattar is looking to redeem himself against his main event before where he was outclased even with his endurance and now he must make some adjustments to his fighting. Therefore I think I will place bets on him.
He has had a long layoff. He hasn't fought since the Max fight and rightly so. You need a real recovery period after that war. Giga on the other hand has had 2 DOMINANT performances this year. We still need to see how Kattar does after that fight. The mental side could be taking a toll on him. Max not only broke his face but multiple UFC records that night.