LOL Messi is definitely NOT the GOAT, He didn't win anything at a national level, even though he's in a very strong national team. Not even a Copa America, and OP wanted to call him the GOAT cause he helped Argentina barely qualify on the last day.
Ronaldo won a Euro last year with Portugal so that puts him above Messi in my book. But both are far from Zidane who won everything there was to win in Football and was an absolute brilliant player. Even in his very short managerial career so far he's managed to win most than a lot of great managers. That's what a GOAT should be.