He's definitely not the new R9, no one can come close to that for an entire career, I'm not sure the human body can actually handle it. He's a new breed, and could be just as good in his own way but the pressure of a world-record fee is a lot for anybody, let alone an 18 year old kid. With Griezmann being out of the picture, I can see an added focus to try to get him. I'm not sure how true the reports are that he is not enthused with United's playing style but if he does come here, it will seriously hinder another talented youngster in Rashford because Kylian's not coming without the starting job locked down. Personally, I prefer Mbappe over Rashford, but I think Rashford can do a serviceable job along with Martial in attack if we get some actual real wingers and Fabinho.
If we're going to get any attacking players not named Griezmann, I'd go with Dembele over anybody in world football. He is the real deal, just as much as Mbappe is and is only 20.