That's the best way to get your copy of Windows, through MS itself. That's what I did with my HP 2-in-1 after I had Win 10 installed during Scheduled Maintenance in the middle of the night without my knowledge or consent. It was just an update over Win 8.1, and I wanted a clean install without whatever sins had occurred in Win 8.1.
The other thing MS did during the Win 10 installation was wipe my recovery partition, so I couldn't roll back to Win 8.1. However, I ended up not caring about that. As you said, Kona, HP installations are full of bloatware, and I never used any of it anyway.
As for Linux, I found the easiest distro to use for drivers and working straight out of the box is Ubuntu. Mint is pretty good as well. However, as much as I like those distros, they are not quite mainstream OSes as yet, which I why I still use Windows as my default OS. I have a Mac Mini with OS-X Yosemite on it, but I haven't used that in a while and won't likely set it up again until we have moved back to Tasmania in a couple of months time.
The extra 4GB of RAM will help your system as well. However, performing regular maintenance will be a must if you want to keep that machine running well. IOBit's Advanced System Care is helpful in that aim There is a free version which performs well, and a Pro version with a few more options and tools, but there are some free stand alone tools that you can downdload via ASC which will also help keep your machine clean, safe and working well... a defragger; a malware fighter; a driver updater and uninstaller. And of course you already know about Ccleaner.
Anyhow, all the best with it.