Used win 8 and 8.1 for ages on my shop bought PC then used win 10 for 3 or 4 months, then built a computer and tried getting a copy of win 7 again. Luckily the local market had two copies of win 7 pro.
I could "upgrade" to 10 again for free, I'll tell you what, I feel like I have my own computer now, instead of some rented computer that Microsoft mothers me about and meddles in my own property which I paid hard earned money for.
You can turn off all the telemetry stuff on win 10 but! You'll find it'll just decide to change your app choices and then you'll go to the 2nd control panel they have and your software won't be listed. It's smooth on the services streamlined side of things which is cool, it's also kind of a childish OS.
Why have two control panels? wtf is that %^&
I've used many Operating systems- over 20 linux ditro's and Windows from 95 onwards, believe me, Win 7 is the best.
Win 8.1 and 10 are still efficient, but they come with that nannying sh*t that I'd rather not have any more. I used to spend so much time just tinkering with the OS to be useful and not get in my way, now I just don't even need to.
I like change, it's not even because I'm unwilling to learn new things. I know windows 8 and 10 inside out. I don't need that sh*t in my life.