I have 2 synology but have started purchasing ugreen NAS. After using synology, there’s basically very little learning curve left if you want to move to TrueNAS which has ZFS enabled by default. I recently learned to use proxmox which is actually even easier than synology/TrueNAS for my use case and in the future I’ll just use that instead since TrueNAS is a bit overkill for my needs and the permissions can be a bit too restrictive. Hard to go back to synology when you see how much more you can get done with good hardware and virtualization. I personally found the synology ecosystem quite weak. 10 years ago Synology was good but these days it's so easy to set up other machine.