Whose better?Tiger or Roger?

The Miami Herald this morning asked readers to vote:

Tiger Woods can whack and curl a dimpled white golf ball with more precision than anyone in the world; he is, arguably, the best athlete his sport has ever seen. Roger Federer can slam and slice a fuzzy yellow tennis ball with more precision than anyone in the world; he, too, is possibly the best his sport has ever seen.
I just don't understand this.Am I missing something?Both men are tops in their field in the world today.Who cares if one is better than the other?