If you trust Microsoft and the US Government with your private keys then by all means use Windows 10. I use GNU/Linux and I must say that I trust the US Government way more than many on this forum.
As for staying with Windows 7, why keep fighting change? The direction that Microsoft is heading in has been very clear for a very long time. I moved to GNU/Linux back in 2006 since at the time I did not like the "vista" on the horizon.
I switched to GNU/linux back in 2009. The only problem for me arose when I bought an HP laptop. It has been a pain in the ass only to install Ubuntu due to UEFI restrictions. After I installed everything, wifi and video card would not work properly and I had to go back to win 8.1
I also tried manjaro linux (based on Arch) and opensuse but nothing changed.
Do you know any good laptop which are fully compatible with linux nowadays?