So called 'God Spawn' was quite literally next to unstoppable. He would win.
Now, there are other iterations of Spawn (the ages), and some iterations would win against prime (some easily), while some would lose (one pathetically). So it is highly dependent on what Spawn (yeah, same person ....that is if we decide not to further complicate it by looking at past Spawns but rather just concentrate on the various iterations of Al Simmons) when it comes to winning or losing.
Suffice it to say that the highest level of Al as Spawn would wipe the floor with EmoPrime, but Emo should be able to have some sort of win against most iterations of Spawn.
BTW, someone mentioned that taking EmoPrime to hell would seriously finish Emo.
Not necessarily (with the caveat that if it is God Spawn it would be over so quickly for Emo, but then again, it would be over because he is up against God Spawn, not because he is in hell per se).
Just a few issues ago (I believe Superman 666) 'normal' Superman was in hell (some ruse by some Kryptonian demon that at the end of the convoluted tale had that demon seemingly taking control of Superman, and him ending up in Earth hell where the demon wanted to take control. Convoluted story)Anyways, Kal finally broke free of the demon's grasp (again, story how he did that which involved the Phantom Stranger I believe), and at the end of the issue he is telling the 3 representatives of Earth hell that he could raze down hell and set them back a thousand years. And those devils say that is true, but then they would cause so much pain to him if he did that that his tears would flood that world.
That was normal Superman.
EmoPrime, particularly if you note the way he made Mr Mxy become his b!tch, literally snatching him away from the 5th dimension, will not be defeated in hell because he is in hell. He would be defeated there because he would be up against God SPawn (for instance).
Put him in hell, and have him face off against first age spawn, and he would defeat that spawn just as quickly as if he was fighting him in the center of a blue-light sun.