I've used Windows all my life, and have never had any major issues at all. I see no reason to switch, and no commercial would ever convince me one way or another anyways, as said commercial is produced by the company trying to sell me a product. I prefer to just look at the stats on the computer, read reviews, and try things out for myself.
As for the OS's themselves, the main problem with any Apple computer is that they are just so expensive it's ridiculous. Main problem with Windows is that any prebuilt computer that has a Windows OS on it will be loaded down in bloatware, and will run ALOT slower than it has the potential to. Luckily, I built my last computer from scratch so it generally runs perfectly (unless I do something stupid like, let's say, not insert the RAM in all the way
) and it was MUCH cheaper.