I have a Synology DS923+ as my NAS which currently runs Plex, Immich and a couple other things.
I also have a Intel NUC (8th gen) which has Proxmox on it which mainly does PiHole and HomePage. I would like to use the NUC for PiHole, Immich, Plex, HomePage and Home Assistant.
Is Proxmox the best system to use for these applications? Would it be easier to just install Debian and Docker and run everything through containers on one OS instead of splitting them all up into LXC or VMs?
I would also like the convenience of easily updating containers through a GUI. I am not afraid of SSH and CLI but it’s nice to go to a browser address and see everything in one place. Kind of like how DSM7 is set up on Synology.
Since you have Proxmox why would you switch? If you don’t like it, then by all means, there are lots of other options. However there is a good reason Proxmox comes up a lot. (I don’t personally use Proxmox so I don’t know those reasons, but the people who recommend it give every indication they are smart people who understand the problem and so I trust them enough to say it is a good option)
Best is a subjective question. There is no objective way to say what is best. We can argue about pros and cons. We can argue about what we prefer. However that is all subjective and there is no one best answer.