I went the DIY route a month and a half ago and it’s been great. I opted for a larger case so I could add a bunch of HDDs and not be limited to the 2 or 4 that’s the standard in a syno, and I’ll keep adding more over time. I got carried away with the CPU and went with ddr5 so it’s been quite more expensive than it should have been and it cost about 700 euro without the spinning disks, but it’s been great with proxmox + a truenas VM (plus a bunch of extra vms for the arrs, tinkering, media servers, web stuff, pihole, nginx, some game servers…)