So, neither data cable gives you good charging speeds with your existing brick?
The problem with third-party chargers like the Anker (at least the Anker I have) is that they do not specifically address the special requirements of the Galaxy line. There just aren't an overwhelming number of them out there, compared to, say iPhones, which is why Anker and others tailor a port (or the entire charger) to that brand.
As I said, there are workarounds- Pwr+ makes a little adapter that goes between the data cable and your third-party charger that fools the Samsung device into thinking that it is attached to a Samsung 2a charger. They are cheap and portable, so that is one way to go, particularly if you tend to plug into a variety of chargers. Of course, if the charger you are plugging into its only capable of providing 1a or less current through its port, then the adapter is not going to do much for you...