Gary was probably a better programmer. Bill is undoubtedly better from a business standpoint.
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi... (pay wall, but you can see the abstract)
I think there's reason to believe he could have been an outstanding programmer. Has anybody read the source code for a program verifiably written by Gates? Was Donkey.bas really written by him?
At my undergrad, something like 1 in 10 incoming freshmen had perfect SAT scores, and I know a couple of folks at Google with perfect scores as well.
Not true, for the math anyway. You can get a few wrong on the verbal section and still get an 800, and don't ask me how the writing works.
In any case, the effects of the 1994 recentering on higher-end scores (for whatever they're worth) are greatly exaggerated.
His DoJ deposition tapes are amazing to watch.