This one is so tough. I think Sinner is playing closer to his potential. Carlos still has a lot more variance in his game. Carlos has had the perfect set up for this final. His match against Tommy Paul was virtually a training session where he was given the space to unleash and see what he's capable of. But he's also had sets where he's been severaly challenged, and not just the first two sets against Musetti. But then Musetti retiring at the time he did, was perfect. He got the test but didn't have to strain himself physically, while getting the correct mental and tactical practice. All through this tournament there have been moments when he's applied the afterburners and completely destroyed everyone. Meanwhile on the other side, no one has even been able to get a set off Sinner, even Novak doing the most Novakian things.
I'll say this... I can imagine a scenario where Carlos gets an early break and ends up winning in 4, purely because for a set and a half he puts enough doubt in Jannik's mind. But I can also see Sinner just ploughing through in 3 tight sets. I think this final will most likely be decided in Sinner's mind. If, in the periods where Alcaraz elevates his game to that spot that's beyond everyone Sinner gets mentally affected, then Carlos will probably win. But if Jannik can stand up and smother those periods, holds Carlos to neutral, then Sinner will win.