Windows 10 Slim with nothing but the core OS and I would upgrade in an instant.
That's what I'm hoping to end up with.
Had to do a clean install of win 10 pro (with unused win 7 key) on new build because win 7 doesn't have native nvme support (using a samsung 951 nvme).
I've set the auto updates to 'ask first' - can turn them off completely on pro (group policies)
Next - get rid of cortana and all the dumb tiles and 'apps' (anyone else hate that word?)
Got to get it to recognise my monitor's max resolution (painful)
Not impressed it didn't recognise my r9 390 - not exactly rare
It didn't install any generic drivers for my ethernet port either, so I had to install the bloatware that gigabyte supply (which defaulted my internet connection to 100kb down, 10kb up - oh the fun that wasn't - like a slow 56k modem)
I think with a lot of taming, win 10 could work