#4 Messi is more prolific overall ( better goals to game ratio)
Lionel Messi has scored goals prolifically for Barcelona year in year out as well as for his national team and has a far better goal to game ratio than Ronaldo. The Argentine has scored 533 goals in 667 appearances for both club and country excluding friendlies at a rate of 0.78 goals per game. Ronaldo meanwhile has amassed more goals overall but at a much lower rate. The 31-year-old has managed 571 goals in 826 appearances at 0.69 goals per game.
There is no doubt that Ronaldo significantly improved his conversion rate since joining Real Madrid (he has scored over a goal a game for the Los Blancos) but the fact remains that he was not very efficient at Manchester United and overall his numbers pale in comparison with the Argentine maestros.