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1. According to the stealth tutorial video, a lethal takedown makes more noise than a non-lethal one.
2. Neutralizing an enemy without killing will award you a +20 XP bonus ("Merciful Soul").
3. Knocked-out guards can be woken by other guards who happen to find them. Obviously, this can't happen if they're dead.

I'm not aware of any impact on the story.

1. According to the stealth tutorial video, a lethal takedown makes more noise than a non-lethal one.

2. Neutralizing an enemy without killing will award you a +20 XP bonus ("Merciful Soul").

3. Knocked-out hostiles can be woken by other people who happen to find them. Obviously, this can't happen if they're dead.

I'm not aware of any impact on the story, though there is a Steam achievement (Pacifist) for not killing anyone except bosses.

1. According to the stealth tutorial video, a lethal takedown makes more noise than a non-lethal one.
2. Neutralizing an enemy without killing will award you a +20 XP bonus ("Merciful Soul"); this is 10 more than the +10 XP you get from lethal takedowns ("Man Down").
3. Knocked-out guards can be woken by other guards who happen to find them. Obviously, this can't happen if they're dead.

I'm not aware of any impact on the story.

1. According to the stealth tutorial video, a lethal takedown makes more noise than a non-lethal one.
2. Neutralizing an enemy without killing will award you a +20 XP bonus ("Merciful Soul").
3. Knocked-out guards can be woken by other guards who happen to find them. Obviously, this can't happen if they're dead.

I'm not aware of any impact on the story.

1. According to the stealth tutorial video, a lethal takedown makes more noise than a non-lethal one.
2. Neutralizing an enemy without killing will award you a +20 XP bonus ("Merciful Soul" This is 10 more than the +10 XP you get from lethal takedowns: "Man Down").
3. Knocked-out guards can be woken by other guards who happen to find them. Obviously, this can't happen if they're dead.

1. According to the stealth tutorial video, a lethal takedown makes more noise than a non-lethal one.
2. Neutralizing an enemy without killing will award you a +20 XP bonus ("Merciful Soul"); this is 10 more than the +10 XP you get from lethal takedowns ("Man Down").
3. Knocked-out guards can be woken by other guards who happen to find them. Obviously, this can't happen if they're dead.

I'm not aware of any impact on the story.