I was curious so I made a comparison of them. Started with Nurkic's 1st year as a starter an Portland:
View attachment 57585
they are close to even in PER; Ayton is a more efficient shooter, mainly because of Nurk's poor shooting at the rim. Nurkic is a better rebounder and passer. And he's a better defender. Ayton has better winshare numbers but he's played on teams that have generated a lot more wins so that skew is evident. Nurkic has a better impact if you gauge by BPM
personally, I think Ayton has become pretty overrated in this forum. He may have more baggage than Nurkic and he costs twice as much