I like the V6 better. I like the lines of the host better, it looks more elegant. I think it would look even better if the tailcap of the V6 was the same as the C6.
I think the C6 would look better unanodized because of its sharper edges. The V6 would look good polished. I seen a picture of where ponitac did this somewhere... I think the V6 would look good anodized marble purple/black or green/black finish.