laver is clearly number one in 1964 he won 11 to 10 tournaments, 2 majors to one,and had head to head 15-4 advantage. rosewall is behind on every statistic when you analyse all play. laver's win loss percentage is also far better.
laver is ahead in 1965 because he won 17 events to 6 for rosewall, and had big head to head advantage about 13-5. rosewall was 2 to one in majors but was completely out played outside the majors. laver was regarded as number one at the time and clealy still deserves it according to these facts.
rosewall is only number 2 in both years.