I hear ya on the aluminum, and unless you're a Farmer, diesel is a stinky, nasty fuel. ANY diesel engine would not work out for me on paper ($$$) due to what I use my truck for. I don't need what it offers vs a ~small-ish~ gasser. I have the 5.7 and it's actually more than I need to drag just me and my SWB regular cab 13 miles in town on level ground back and forth to work ! LOL!!!
Still nice to read about 'aluminum', 'V-6 Diesel', '2.7 Eco-Boost's," etc!. (Saw the cut-away version of the 2.7 at the auto show,,, JEESH!!! 4 tiny valves in each tiny {450 cc} cylinder,,, seemed like a toy!)
I also agree, between GM and Chevy, I like the GM's appearance better!
Even so, it seems like most new vehicle looks take time to grow on me,,,