The Mac selection frankly feels way better and bigger to me. I would go even further and claim that the main advantage of OSX over Windows is the app selection in both quality and quantity!
"I think the main reason many people end up using Windows over OSX, or any other OS, has always been the knowledge of software."
Like how to do X in software Y, or what software can one obtain to do task Z.
Probably the Mac App Store changes that, and certainly the perception of it. Also even timid users are much more inclined to go and ask stuff on the Internet, and not solely rely on their inner circle.
Canonical knew that even before the App Store singularity and tried to design a simple user-centric application finder in Ubuntu, alongside the very technical Synaptics package manager. Also they tried to push users to ask questions on forums on the very first page Firefox displays.