New
#11
At the time I loved 7 but I agree with the above, 10 performs better and is overall easier to use.
In terms of "spying" I believe they only track things like how you used your computer, what apps you used and for how long and may be your IP but no personal information. If you're worried there are software to counter that such as Shutup10 but I don't personally use that. As long as your not breaking the law, you don't need to worry.