Aside from just looking neat, bright colors are safer in my opinion. I have stared straight at a buddy on a blue/black 2010 Summit, against trees, wearing black gear, and not seen him.
Another buddy on a 13 Summit (orange and black), with all black gear, same thing almost, I was looking for him from a mountain top and never saw him until he moved.
I wear bright green or orange gear, and ride bright sleds. If nothing else, when an avy hits my arse, it will be easier for them to find me and my stuff, to a degree.