We are sometimes asked which NAS unit is the best to buy from the three of the lower cost line of the two drive Synology NAS models. The basic Synology comparison table isn't much help here. It just says that the DS212+ model is for "Small and Medium Business", the DS212 model is for "Home to Business Workgroup" and the DS212j is for "Home to Small Office."  The more detailed product comparison chart is a bit more help but provides, if anything, too much detail. Ignoring for a moment what the definition of those various categories might be given their apparent overlapping nature, just what is the straight story of which model to choose for your needs?…