Even though Cristiano Ronaldo has won the Ballon d'Or, due to the fact he won Euro 2016 and the Champions Leage, Messi's personal success was better.
The Argentinian has scored so far 58 goals and has made 34 assists. For now, he is the best goalscorer in the Spanish League, as well as in the Champions League.
He won two titles with his club and reached the finals of the Copa America but Chile won the trophy.
Barcelona aren't having their best moment right now, but Messi is having it certainly. No one has scored as much goals and has made has made as much assists as he did. He's the leader.