It does matter in terms of how much less polluting it would be. Even in case of coal plant bonansa it reaches a point where it becomes less poluting than gasoline car . Alghtough much slower. Its also not realy important since renewables became so cheap that there is practicly no country that dosent have a fairly significant renewable share ( and by that i mean > 10 % ).
I would say gog is probably closer than epic. Its actually managed to still be a thing despite steam being op as f in every way possible. And the last time i used it it was decently competent launcher compared to epic which was a travesty.