I tried windows. I stopped because I didn't like all the telemetry they collect on users, including your keystroke and stylus movements.

They say they do this to train Cortana, but it has the side effect of giving the NSA a front row seat to everything I do.

You known this is optional, right? You can turn it off during and after installation of Windows.

Also, Android and iOS + most of the popular apps you use, including the desktop ones, use some kind of tracking/telemetry and you don't even have the option to disable.