Applying negative selection, QNAP has a terrible security track record and WD has terrible performance and security track record. So if you want something that's mostly plug and play, Synology it is, consider a "+" model if there's any chance that you may expand beyond the simple file sharing use case.

Disclaimer: I currently own three Synology boxes (718+, 220+, 216j) and a QNAP TS-453D running Proxmox (for fun and as an attempt to move towards a HW vendor-independent solution).