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In terms of sheer numbers, I'd guess you are right: more Win32 applications have been written since 1995 or so than there are apps for iOS. Especially if you include in-house software.
In terms of applications to do something most people want to do, which is a subjective measure I admit, iOS may have the lead. Particularly so if you look for software that's optimized for tablet use: there are a lot of very capable Windows programs which are rather less usable on a tablet than with a physical keyboard and mouse, whereas iOS apps are all designed around touchscreen use.
For example, I've been looking for a map program (similar to Google Maps) that runs on a handheld Windows 7 PC with attached GPS. It's surprising how few choices there are that do the basic function of showing your GPS position on a map, and aren't some crusty thing last updated in 2004. True, if I included Windows 8 "Metro" apps there would be a wider choice, but still it is dwarfed by what you get on Android or iOS. (FTR - in the end I went with Anquet Maps for hiking maps and Mapfactor PC-Navigator for city use.)