I am looking at both the Swampfox kingslayer and the at3 aro red dot.  Which would you guys choose?  Battery life is longer on the aro,  the aro comes with a cover and has 6 brightness settings.  The swamp Fox I like the fact you can get a green dot with a circle, no cover and less battery life.  Both are highly rated and both in my price range.  Help me pick!