WHO DESERVE THE FIFA BEST PLAYER AWARD

Lately, so many questions comes to my mind on the yard stick used in determining who is the best footballer in the world. I asked myself self many questions like is it club achievement, individual achievement, or what.. But I'm beginning to understand that it's determined by goals scored and one of either champion league or World Cup.
However the question is does Messi and Ronaldo deserve all the balloon d'or they won?