I defended Big Mom in the previous match, but now I think that Kaido would win.
Although Mama has an theoretical attack power advantage by absorbing lifespan, she herself has proven reckless in skill — Btw, Kaido also gets stronger as he gets drunk. In short, Kaido has better skill, a far better CoO and better mobility. Being a Zoan, it is likely that Kaido also has greater stamina, however, we know that Big Mom can give life to her bones, and that naturally she can fight even with critical brain injuries and pulverized organs. I doubt there's a huge advantage in terms of physical conditioning for both of them, so this fight would be boiled down to pure technique; whoever hit the opponent more times and had the agility to defend without being hit would win.
With that in mind, the Observation Haki of Kaido's would be he main factor to lead him to victory, since Linlin's predictable blows would be even easier to anticipate and counter, and so Kaido would also have a door to open new blows directly on his target (which would be the head, as Kaido loves to aim for the head almost always). I vote for Kaido because he fights better, smarter and more brutal than Big Mom, but I understand the counter-arguments (As imaginative as they are like: Big Mom making Kaido's Kanabō, a homie; something she never explores in combat).