Yeah, I don't really want to make this a big thing. Carthaginian and Punic are, more or less, synonims, so , strictly speaking, it really doesn't matter the word we use. I only think that the latter sounds better, because, as we'll put Numidia within the same culture, it seems more abragent for the people that don't know that well.
But now I'm curious, why do the german historians consider that "Punic" is a negative name given by the romans to the carthaginians?