I enjoy having a choice for most enemies, like I never kill the rats in Tomb Raider, they're just chilling in the cistern, swimming around, have the time of their life!
I'm not gonna be that guy and crash their party and mass murder them, hell nah, I'm jumping in and having a swim with them, good times, worst case scenario I get some love bites, it's all good, I ain't even mad.
Pierre, the gorillas and the crocodiles had it long time coming though. They're getting gunned down on sight.
Kill the legs first, that's an ironclad battle tactic!