Bananas will always be bananas, whether ripe or green. The main difference is that green bananas have to be cooked and when they are cooked/heated, they lose most of their nutritional values unlike the ripe banana that can be eaten raw.
You are right in the sense that cooked banana is always different from the one that is ripped and eaten raw. There is no way we can really compare both of them as long as I am concerned in which one that is really good.