There are many different PC manufacturers, giving customers lots of different options and brands to choose from.
Microsoft may be in the hardware business now, but companies like HP, Acer, Lenovo, Dell, and many others still make the vast majority of Windows PCs in the world. This offers variety and features that can fit anyone's budget or preference.
With Windows 10, Microsoft tried to make one operating system that can run on laptops, desktops, tablets, smartphones, and eventually, the futuristic HoloLens holographic goggles.
Apple makes both the Mac hardware and the OS X operating system software, so you only have a handful of options if you want to buy a Mac.
If you want to get really technical, it is possible to build your own "Hackintosh," or a traditional PC that runs Apple's operating system. Here's a quick guide if you want to learn how to do it.