Ya I'm kinda iffy on Berardi but I'm pretty sure on Coman. Morata is already a decent player, he can only go up from here.
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Berardi has shown much much more than Coman. You could argue that Coman has more potential, but he still needs a lot of work, and I think it isn't as certain that he'll fulfill it as most here are. There have been greater talents who flopped for unclear reasons. Berardi is much nearer to a "finished product" than Coman at the moment, and while I'm not 1005 sure that he'll succeed, he's already at a later stage in his development as Coman. Which is no problem really, Coman still has time, I mean even if his real breakthrough only happens 3 seasons from now, he'll still only be 21, younger than Morata is now.