What if... Goku and Superman merged?

How powerful do you think they would be?

Amalgamime.

There shall be peace between comicvine and animevice

Yep.

Well, Superman's energy projection powers would improve, at which point, he'd have no real holes in his powerset, and would likely be way too powerful for his rogues gallery.

If sundipping increased his power beyond Super Saiyan/Kryptonian then he would be really over-powered.

True that. Imagine if Superman Prime One Billion went into Super Saiyan God mode.

They would be unstoppable.

He'd become the most hated villain in whatever universe he is in and only a handful of people could stop him. Not to mention fans wouldn't like the combination.

Villain?

There truly wouldn't be much difference considering how Prime One Billion is pretty much God.