For my first playthrough, I'm planning to play stealthily. I won't run and gun cause mayhem, but sneak around and take people down without alerting anyone. I've noticed when grabbing people, I have the option of doing a lethal, or non-lethal takedown.
Is there any reason why I would want to choose the non-lethal option?
I could utilize silent (and lethal) weapons and that will make things easy, but why would I want to go slower and stay non-lethal (other than for challenge)? Are there any perks that could level up staying non-lethal? Will I be able to turn the enemies later in the game for whatever reason? Will a boss character be more sympathetic to me if I left their minions alive? Or will I gain anything by ensuring everyone dies?