Williamson is, potentially, a freak. Just so physically imposing. Too soon to know how that translates, and what his work ethic is, but I would say it gives him the highest ceiling.
ZW’s ceiling is essentially LeBron. Maybe better. But that’s his *ceiling*. Does he have the same drive to dominate? Can he stay healthy? Remains to be seen. But what he’s doing to college basketball is insane.
Tatum’s ceiling, I would say, is top 5 - 10 NBA player. Maybe something like Durant, more likely a hair below. I think his odds of getting close to that ceiling are better than ZW, just based on the longer track record.