James' actual dunk, especially James' chop, is very domineering. Many fans can't help but save photos when they see James' seal, and use James' seal as their wallpaper. Zion's dunk is also very explosive. It can be said that grabbing the rebounds in the frontcourt and dunking many times under the basket also brought a lot of shock to the fans. But I haven't seen Zion show much dunk skills, so I'll choose James for the time being.
James and Zion are actually very similar. Both of them play small forwards, and both of them get a lot of attention when they enter the league. Both of them play in the same way, and both rely on physical breakthrough. James is better at ball dealers and global vision. Zion may be better at jumping and carrying loads. On the dunk alone, James' previous dunk in the Heat was really eye-catching and really awesome.
Many people may think that the two-point take-off dunk before the letter brother is very powerful, and some people who don't know the ball say it's NBA 1 actual two-point dunk. In fact, James did this many years ago. James's two-point dunk feels more elegant and the whole person dunks more. I wonder what kind of player Zion will become in the future? But James is better than Zion in dunking.