Long story, but my Surface Pro 2 wound up with Win10 Pro. The Pro version is
slightly more configurable for privacy than Home, but only the Enterprise version can completely turn off the telemetry and so on. Of course Enterprise is not easily available to end-users and it is expensive.
There are some utilities available that are supposed to improve the privacy/security of Win10 installations, e.g., [0].
My wife kept asking me if she should upgrade to Win10 and I said "don't do it". Since Win8.1 will be supported until 2023 or so, it really didn't matter. Now, thankfully, the "free upgrade" period is over and she won't be nagged to do the upgrade.
After all the years in the game, we'd think MS should know better than pulling all this crap on its users.
[0] https://github.com/10se1ucgo/DisableWinTracking