Hey Genn, you asked me a few pages ago which one I think is stronger, SSG or SS4. Well, I've been lazy and haven't really been posting on forums, so here's my delayed answer. SSG is too unknown without seeing it in action more times or getting a statement about exactly how powerful it is. We know SS4 is roughly a x10 increase over SS3, but we don't have that kind of data yet for SSG.
So I'm gonna say not information. If someone twisted my arm and made me answer, I'd have to pick SS4 based on knowing its power and the fact that it's significantly stronger than any previous Super Saiyan form.