It so happened that I bought a prebuilt PC in February of 2014 that came with Windows 8.1. That PC is named MSI Prestige MS-7903 - it is a desktop with a micro-ATX motherboard (MSI A88X Gaming), it runs an AMD A10-7890K APU, 32GB of Hyper-X 2133 MHz Non-ECC DDR3 Memory. It uses an AMD Radeon R7 120G SATA SSD for the system and a WD VelociRaptor 10K 250GB HDD and a basic Thermaltake 430W (or whatever) PSU. Everything is packed into a Silverstone Milo ML03B case. In June of 2020 I made an upgrade - I bought an AMD Radeon RX 550 Low Profile to enable dual graphics.
I needed a new PC at that time 'cuz my old one had BSOD troubles and I had no time to diagnose it. It were my school exam time coming, so I just bought a new PC. I have done some sound/thermal isolation on the case, so it is not as loud. There were some time that I wanted to install Vista x64 to this PC, but I decided not to do it since Vista lacks FastBoot and TPM on my MOBO doesn't work correctly. (Still I don't know it is TPM v1.2 or TPM R2 since UEFI reports v2 while Windows says 1.2 version).
I also have installed a few patches - OldNewExplorer, StartIsBack and AeroGlass 8, I hate the lack of transparency in Windows 8.1. Now, I almost never use this computer, about two or three times a year - I have resurrected my Vista machine and bought a gaming computer in 2017. It just sits on my balcony, I use it to watch YouTube and browse social media. I can't say that Windows 8.1 is my favorite OS, one of them, but not the most. Had no trouble using or administrating it. I also like Windows 8.1 Metro style, 'cuz it is better in my opinion than Metro in Windows 10 (it is too rounded). So, if you are looking for an OS with modern features like FastBoot, SecureBoot, nice interface with an ability to tweak it, and not outdated NT-kernel like Vista, something like Windows 7, but still supported - Windows 8.1 is your choice.
P. S. sorry for my English, I am Russian, as you can see on my system screenshot...