Synology is great if you want to stick to using their GUI, which is very capable. If you are more of a DIY/CLI person, I would avoid Synology and similar products. They have everything set up in a very particular way, and you can’t mess around in the backend too much without risking corruption of some kind.

You spend less on a used computer with Ubuntu or FreeNAS or some other distro, have way more flexibility, but a lot more to maintain.