Personally, I always plan on installing Linux. I'm going to wipe the device either way. Showing me that you've tested the thing with Fedora and that secure boot, and all the peripherals work already is a major plus for me. It saves me from doing the research and guesswork on the specific hardware. The second hand market is so iffy about giving enough info to do hardware research with stuff like Linux hardware probe.

I would install Fedora, then Linux hardware probe and do a scan, then attach that info. This would be worth more than most descriptions and likely generate more interest. If you sell W10 at this point, you're looking for someone gullible enough to buy something useless in just 4 months from now. With Fedora it is still a fully ownable machine with a long and bright future.