Injustice Superman is a Superman who snapped and killed the Joker of his World and took over the Planet
Batman who Laughs is a Batman that also snapped and killed his Joker buh got poisoned in the Process with Joker Venom. He has killed every Superhero in his World and now serves Barbados the Bat god.
I'd have to say Batman who laughs as much as it pains me. Mainly because clark at this point is at his most emotionally and mentally unstable. He isn't fully there. He's just in consistent pain and if you manipulate it, he could destroy everything including himself and the Batman who laughs will literally watch the world burn before he looses and has.