Steyr Aug Camo vs XM8 Adv

What 1 is better I can headshot with both (thats sort of the point of those guns I guess) but I just can't deside which 1 to get. I like both of the looks aswell the XM8 Adv is just like playing some futuristicle game and the Steyr Aug Camo .. well lets just say I love the Steyr Aug to.
So my question is for those who have both or can give me good info (I don't want to hear from somebody who only has 1 gun and is such a fan of it that he/she will trash the other)
about it which one I should use.. or more clearly which stats are overall better?

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