It is just a matter of opinion, but I think Messi has stil to proove. If you compare to Pelé: 1200 goals in 1300 games, 3 WC, 2 Libertadores, 2 CWC, 6 Brazileirao, etc. I know it is not about titles, but Messi is young and we dont know for sure how the rest of his carrer will play out.