My homelab started with a Synology NAS as well. At first I put a few VMs on the NAS, and then I expanded the homelab to include a single PC. I almost bought a NUC instead. I’m glad I didn’t, because the NUC only offered one advantage: it was small. Beyond that, the PC was better in every respect. More expandable, more configurable, etc. I decided to get a really small PC case intended for home theater PCs to get some of the smallness offered by the NUC and called it good.