Stay with Windows 7 ! :-)
Or at least make a backup image of your Win7 system so you can go back or even better...dual-boot Win7 and Win10.
I have not done so yet but I want to have 7, 10 and Linux on all my boxes... Linux I like to use for doing things online that I want to be as secure as possible.
Apple's OS is very good and I can't fault anyone that wants to go that route....it's just not right for me.
I just bought Win 7 from Amazon so I can revert. Win 10 makes my new $2k laptop unusable. Unfortunately it came with 8.1 pre-installed so I can’t just roll back.