Fight to the death/surrender.
Guns allowed, but would not be the deciding factor. Environment plays to both of their strengths and weaknesses.
Who wins?
Go.
Black Widow, as in the one from Iron Man, not the spider.
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Edited by Felicia402: 2/28/2013 4:45:05 AMI know nothing about Lara Croft, so I can't say. She'd have to be pretty bad ass to keep up with Black Widow though.