I know some will disagree, no problem.
Forget the names Nadal and Fed, just look at the numbers. There were great things in both seasons and so I isolate the seasons, I don't consider who needs which slam or how many times in a row a slam is won. Just the results from the year.
If you want to add importance as far as what is needed then you can if you want, but ten years from now it won't matter much.
I think there's more to it than straight numbers (which hardly favor Fed anyway), but we'll agree to disagree