The Singapore plant is the best; the plants in Taiwan and India are not as good. I think that Datalifeplus discs have at times been outsourced so I suppose it depends. (Aren't Datelifeplus discs being phased out anyway?)
In my personal experience, discs from Singapore are great, discs from Taiwan are generally fine, and discs from India are awful and are a waste of space. I have had discs from Singapore that have had various kinds of packaging and labelling but have seemed the same in terms of quality. Basically, I would suppose that if the discs are marked "made in Singapore" whatever else is on the packaging/labelling doesn't matter. (I cannot give you a technical answer though.)