I'll let Marc handle this one because I keep flip flopping on how I feel this one will end up.
On one hand, their styles are perfectly made for each other. And should produce fireworks that end in knockout for someone.
But... GGG is a very smart fighter and when he respects the guys power, Lemiuex or Jacobs, he fights a very different, cautious, fight than his normal educated pressure fighter style. Throw in that Canelo started his camp almost a month earlier to bulk up for the punishment and is in ridiculous shape and i think the formula is there for a tense 12 round fight.
...but.... the scorecards are already in. It's Golden Boy, it's Vegas, they were turned in months ago. GGG knows he has a very small chance to win on the cards (Canelo got a fn judge to score him the Mayweather fight) and may have to abandon whatever plans he has and really throw caution to the wind.
If I had to wager, I'd lean towards a 12 round fight because when the stakes are high, each fighter is always overly cautious.
I was gonna pop in here and bug everyone on how they feel this one is going to turn out. I'm super pumped for this fight and I think it's because Im torn on who I think will win and I don't have a true rooting interest.