Reinhard 9/10
Satan can only copy powers, not equipment, so he can't copy Longinus.
Satan has no resistance against concept manipulation, so Longinus completely wrecks him.
Satan is an almost purely physical fighter. His power copying is about the only hax he has.
Satan's "lives" (as of the most recent chapter) are either resurrection or regen. No idea which. But even if they can help him against Longinus, or Gladshiemr, or the LDO and their soul manipulation and other hax, he only has 3 lives, one for each of his horns then his final life.
AFAIK, literally the only way Satan can win is if the following things happen:
1. Reinhard uses his fire powers. 2. Satan dodges said fire, because even if he can absorb heat and light, that fire damages the soul. Also, he probably won't dodge because he thinks it's just fire, which he can absorb. 3. Satan copies Reinhard's fire, and uses it back against him. Because this fire can damage the soul, it is the only way Satan can get past Reinhard's low-godly regen 4. Reinhard must fail to dodge or defend himself against this, or be in Gladshiemr at the time
...
Actually, I suppose that Satan could possibly copy Reinhard's Briah, in which case he has a better chance depending on how much of Gladsheimr he copies (whether he copies the Einjhar as well), or copy Reihard's law, in which case it becomes a 1-A vs 1-A and who cares about those.
Edit: First off, that bit about copying Law was a joke. A JOKE. Obviously Satan can't copy Law. But not for the reasons you are thinking. Because you don't need 1-A powers to use law. If you did, Reinhard and Ren would be 1-A without it. But they are not. You don't need to be 1-A to use Law. Law makes you 1-A. Only reason Satan can't use it is because he wasn't born for it.
