Just completely moving back from Synology to RPI4 on my brand new Argon One M2. The experience is fantastic, Debian 10 for Raspi are very nice and stable furthermore it’s bootable from M.2 SATA III 128GB make it fast. The casing gives RPI a great look and active/passive cooling makes it even better.
HA + Supervised supported version makes it better, combine with portainer as docker controller outside supervisor makes it even better. I’m now can combine both worlds. So, for those who run out HA Blue can grab this as an alternative.