Nope. Federer's best surface is indoors. Murray prefers outdoors as he is great with the elements. US Open Final is a great example of that.
Since 7 is greater than 6, I'm gonna say that grass is his best surface, but to answer your troll, sorry post, when I read things like "headcase", I think of Murray, not Fed, when I read, "fall in a tailspin", I recall Murray's losses to Donald Young and others last year and have the perfect image of someone in a tailspin.