It's crazy how Clooney's Batman was more faithful to the source material than Snyder's Batman.
It's crazy how Clooney's Batman actually feels way closer to the Batman from the comics than Affleck's did.
The no-kill rule is one of Batman's biggest things across decades of stories—he straight-up refuses to use guns or take lives, he captured his villians and gives them a shot at redemption instead of straight up killing them like Affleck did.
Every villian from "Batman & Robin" gets taken down non-lethally and shipped off to Arkham alive. And he even saves his wife Nora and shows real empathy for the guy's tragic situation and basically appealing to the good still left in him. That's classic Batman compassion.
Affleck's version? He kills multiple people on-screen in Batman v Superman with guns and explosives from his batmobile and batwing, brands criminals who then get murdered in prison, and was fully ready to execute Superman with a kryptonite spear instead of trying to have a conversation with him 1st. That's a pretty massive break from the moral code we know.
Clooney also absolutely nails the classic playboy Bruce Wayne vibe—the charming, high-society guy who's the perfect public mask to hide the darkness underneath. His Bruce feels suave and socially active. Affleck's Wayne comes off way more withdrawn, cynical, and reclusive.
When you stack it up against the comics' focus on the unbreakable moral code, compassion, Bat-family, and the playboy facade, Clooney's version hits closer to the spirit of the source material.