I started on Elitedesk 800 G1s when Raspberry Pis got hard to find and expensive, and I now feel they are better in every respect if you don’t need the GPIO pins.
Every time I open them up to upgrade something I’m impressed with the level of engineering. There are quality manufacturer manuals for them, the cooling is good and they look great
I haven’t ever figured out how to pass in the QuickSync to my Jellyfin, but also have never had the need - seems to sit around 10-15% of two cores if it has to transcode something.