This is a great description of both. But I'd like to add tenacity to Grimaldo. The kid bares down on attacking players with a certain level intensity I haven't seen in a fullback in a while.
Mendy: Bigger, Stronger, better in the air and a superior cross.
Grimaldo: Better technique, better vision, better team play, better defender, better passer, quicker and more fluid in his play.
Both are injury prone so that's wash. I know it seems like Mendy is in the book, so the general trend is to big up the guy we are getting. But given a choice btw the 2 I'll take Grimaldo every time. And I'm a bit shocked (if its the case that Mendy is 1st choice) that Pep prefers Mendy.