One has been modified trough selective breeding over the course of many generations, the other one's have been artificially modified with whatever magic sciencetrick they used for it.
People have the right to know what they buy, why wouldn't you label GMO's? It won't cost the consumer anything. Using a experimental method (don't claim science nows everything about gene's, they don't) to change organisms so they can serve a purpose is a good thing, not letting people know what they consume isn't.