Ideally one that can use more than one disk so that i can expand it later when i can. Have some minimal experience with Synology since there’s one at work and i have interacted with it a couple times and like the interface, but am not married to any brand as long as it works.
Located in EU if it makes any difference.
I wouldn’t recommend a Pi 4 even if you can get one at the listed price. It is fast enough but it lacks the interface and connectivity for a decent NAS.