I am running Windows 10 Pro on a Surface. I haven’t seen a single ad, anywhere. If that’s your only reason let me set your mind at rest. Surface is a better Mac than a Mac at this point. That’s why I upgraded my old MBP to one rather than a new MBP.
But by all means ignore my advice and pay through the nose for a device that is blatantly not fit for purpose, I'll be over here enjoying the superior computing experience that Steve Jobs would have wanted me to have!
I had to change a registry key to stop it from installing Facebook and Candy Crush on its own.
Yes, the promotional app stubs are advertisements, but they're easily removed and don't re-appear. In my opinion, removing the tiles you don't want is closer to an act of operating system "customization" than the user experience with ads on the web.