Size, sure. Fantilli has the edge in skating and I'd say between him and Carlsson it's probably even. Skill, I think it's a lot closer than the pro Michkov crowd make it out to be as all three prospects seem to have elite hands but I'd put Michkov in a higher tier than Fantilli and Carlsson.
I'm just going off limited footage I've been able to find in anticipation of Anaheim's selection but my takeaway is Michkov is the most naturally skilled all-around, Fantilli has good stick handling and a penchant for making short area passes with angles most kids his age wouldn't consider, but at the same time his tendency to try to carry the play all by himself tends to result in unforced or avoidable errors. Carlsson seems to have good puck handling, good offensive zone IQ and strong vision (I can describe all three this way) but he seems to be the most tentative of the three to use his skills and seems to often be more of the bull fighting for open ice and using his strength to fend off physical pressure in the open ice. Given that he is such a big strong body already, I found myself seeing him be inconsistent with his willingness to use his body along the boards.
End of the day, for me, if I'm judging these guys on ability alone without consideration for extra hockey matters I'd rank Michkov second but I don't think Fantilli and Carlsson are too far off. I think all three have elite upside. Just for me, the team I have a vested interest in is Anaheim and I just think the risk is too high when there's two great guys as options at 2 or 3 where they're guaranteed to draft. But then again, I'm not a pro. I just watched as much footage as I could in my free time from what I could find.