I am absolutely shocked that Gates is winning this by basically a landslide.
As a preface, no, I am not an Apple fanboi. Macs are overpriced, I do not own an iPhone, and think iPods are pieces of rubbish that are stale in innovation. I also see no need for an iPad anytime within the next 5 years at least. That said, my current computer is a Mac.
While Gates arguably built the bigger company in its prime, where is it now? MSoft is still trying to play catch up to Apple, and is losing market share in PCs every day (both to mobile devices, and traditional computers).
Jobs and Gates started around the same time, but with vastly different approaches. Apple, with Jobs at the helm, released the first massively available GUI OS if I recall correctly, later to which MSoft was inspired to create Windows. DOS used to be MSoft's focus. MS's approach worked at the time, kind of like how Android is working now in the mobile space, although Android has been late to Apple's party.
Apple then tanked, due to the explosion in the PC market fed by MSoft. But then if we look at the return of Jobs, it puts him and Gates even at the least. If Jobs never returned, this would not be a debate.
But when Jobs did return, he started with mass marketing mp3 players. MSoft under Gates? I think the Zune came later? The iPhone? That ignited PDA's, and got Google into the game who was a search engine company for crying out loud. How was Windows Mobile under Gates? Not any where near the appeal of iOS. iOS is basically destroying RIM, and already destroyed Palm. Windows changed the entire name and feel for Windows Mobile, creating Windows Phone.
Then the iPad, which I do not get. But it created a whole new category basically, and people are eating it up.
Products introduced under Jobs reign have changed everything in their category, and in some set the standard year after year (iPhone & iPad). Where as MSoft is still basically a software maker that is widely adopted, Apple diversified and controlled their product markets outside of PCs.