As per Canelo:
"He is a fighter who comes forward looking for a fight, who does not give you a chance to breathe, to get your rhythm going. He is a fighter who has many qualities, a lot of power too, but we are ready for this and for more. I think at these levels we have to fit in with everything with the experience we have and it will be a great fight. I'm ready for this and these kinds of challenges are the ones I like in boxing to keep going and make history," said Canelo.
https://www.boxingscene.com/canelo-expects-great-fight-with-smith-aims-work-with-all-promoters--153374So he knows whats coming, so he already have plans to offset Smith's reach and height advantage. And we are glad that he is willing to fight anyone whether in his division or go up again like the Kovalev fight. So I'm not seeing Callum winning, we haven't seen the best version of Canelo yet.
They're professional boxers so usually they know how to deal with someone who isn't their height, and has the height advantage. Its quite typical for a fighter to spar in training camp with boxers similar to the style of their opponent. Personally, I don't think there's much of an impact with height advantage as people try to make out. Of course, it has its factors but being taller than your opponent also leaves you open to certain type of attacks. Mike Tyson in his prime was one of the smaller boxers in terms of height, yet he fought on the inside, and made a massive career out of it. His ducking, weaving style is what made him so dangerous to those that were taller than him, and of course his killer uppercuts.
Tyson is different though, he was ahead of his time, and combine that with a one punch knockout, he was one of a kind boxer. Oscar Dela Hoya though, when he was campaigning on the welterweight during his prime, he is taller from most of the boxers at that weight class, so he was again, a combination of fast hands plus his length and reach advantage. So it's really up to Callum on how he takes advantage of it in the first couple of rounds and gauge the distance.
I don't think we've seen the best version of Callum either, and there's no way to tell if we'll see either fighter at their best in the up and coming fight. I would say, it'll be decided on points, and be within a point or two if I was going to make a prediction. I wouldn't advise anyone betting on this fight though, because it really could go anyway. Canelo has definitely got the experience to avoid a knockout, while Callum has definitely got experience, but he might be a little more prone to taking chances than Canelo.
Yes, we can only judge them with the level of oppositions the have face before. Last time he looks awful, so that might sway bettors against him. Canelo has a granite chin, that's one factor to think as well. Again, I've seen boxing gamblers here taking the risk of betting on the underdogs