Lawson, no question.
Keyes died because she was an idiot. She put herself in a terrible position, and then couldn't make a move. She died because she was incompetent.
Lawson by contrast was a trash character that got better over time, which is a good way of endearing it to the player. And she was fairly useful in game ability wise.
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She didn't think she would make it out anyway, she was trying to bye the chief time. She also knew that killing Johnson and herself would stop truth but would you hesitate to having to shoot someone you call a friend?
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Not in that circumstance. And even then that's still an extremely poorly written scenario. Was the Pelican out of ammo? Because had she fired any of its weapons before landing she'd've been fine. Had she just aimed it a little more towards the important thing in the room she might've destroyed it and given them unlimited time. Had she done anything literally anything else she probably would've been more useful.