If you only have OWC enclosures, you can use the XT version, which is a bit cheaper.
I just don't trust NAS solutions since their software are insecure and susceptible to attacks such as the DeadBolt ransomware, which affects QNAP NASes along with lack of long-term support when the manufacturer drops support. You can't load a new OS on it once the manufacturer drops support and have to buy a new NAS device that is supported. That is why I prefer using a Mac mini as a NAS or building your own and use TrueNAS or Unraid.