You said Tiger >> Roger, and that golf is far more competitive and popular. After you made those assertions you asked a little more about tennis, but it was clear your mind was already made up.There are less top competitors in tennis because of Federer's dominance. It's difficult to usurp #1 if one guy is winning every major tournament. I don't think there is a good way to compare the depth of the talent pool, but Federer has clearly been at the top of his game longer, in a sport where competitive longevity is more difficult.
well I do believe that golf is far more competitive on an event by event basis and certainly in the 4 'majors'. There are less players in a tennis tournament, correct? And how many have a real shot in those seeded events? Federer doesn't beat them all to win a grand slam event. You can say that there are less top competitors because of Federers dominance but I could say the same thing about Tiger's dominance. If he doesn't win 14 majors, you might see a few more guys in that 4+ range.
As for popularity, i'd have to do some more research but I do still feel that globally, golf is more popular and growing faster. I don't know if any "numbers or stats" are broken down specifically to mens tennis and mens golf or not but I feel like womens tennis is much more popular than womens golf and would probably skew those numbers a bit. I see some websites where you likely got your info and they list "estimated fans" and regional popularity. If you were referencing 10balls or mostpopularsports.net those are going off of website traffic, it seems... aka fan popularity. I apologize if thats what you thought I meant by popularity. I was really referring more to the popularity of playing the sport which leads to talent development and growth of the game