Lmao is this a serious question?
Luka will be an All-Timer. Zion will be a guy we talk about for a few years, riding his prep and college hype. He will never fulfill the expectations of a #1 pick, but he'll have a Blake Griffin-type career if he stays healthy, make a few All-NBAs and All-Stars, be a good pro...
If he ever wins a ring he won't be the #1 and if his health becomes a factor, finito early...
Luka is getting another parade to Dallas and is about to run the 20s with a handful of other guys (Tatum, Giannis, a couple guys as yet unknown), Zion will be 2and tier "super"star below those guys at his best...
Not even a real debate as far as I'm concerned...