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 have an HP 800 G4 arriving in the mail any day now. Right now I run most of my stuff on a pi3, including openvpn, transmission, minidlna, grafana, backuppc, and postgresql. I’m looking forward to porting all of that, plus suricata and dnsmasq, onto the G4 when it arrives.
You’ll have so much more room for activities!