Comparing the 2015 QNAP TS-253A and the 2017 TS-253B NAS Before I get down to which of these units is better at what task, I think it is important to know the things that BOTH of these QNAP NAS devices can do. So, whether you decide upon the QNAP TS-253A-4G NAS or the QNAP TS-253B-4G, you will defi