I'm sure this has been discussed, but here is my opinion. The chevy's bumper is so jacked up looking. The GMC is much much nicer. Here...

http://images.leftlanenews.com/content/33-2007-2008-chevrolet-silverado-gmc-sierra-2500hd-3500hd.jpghttp://images.leftlanenews.com/content/30-2007-2008-chevrolet-silverado-gmc-sierra-2500hd-3500hd.jpg

On a different note --
Are those cab lights LED's? If so that is a first among the big manufacturers .....

I just think the chevy grilles look much better...the gmcs have the old school look, but if you like that look then I guess the gmc is for you. Either way its a badass truck.

The one thing I like about the chevy bumper is the chrome. My 05 has plastic everywhere on the bumper. I would think the GMC would get rock dings in it too. The chrome should hold up well.