Hi there

Personally I'm on W7 Ultimate and really I wouldn't update/upgrade to W10 if you don't it as most of apps and programs are still supported on W7/W8.1 and going to uncharted territory not sure if I would go again,tried W8 and reverted to W7 within day,I would wait until they sort those issues and ability to turn off updates this is important for me as I don't want again reinstalling the drivers as Windows always find earliest drivers and not last,Cortana marketing targeted ads and privacy settings are important for me

Due this I'm still on W7 and will be unless I couldn't find drivers or apps will no longer works with W7,I don't update my PC at all(last update caused only me only headache) and I don't use any kind of AV,with AV I've got more viruses like without the AV,only thing which keeping my PC safe is few scripts for Chrome  

Hope this helps

Thanks,Jura