Fords just seem more comfortable to ride in to me. Something more "work truck feeling" about a Chevy. I love the huge back seat area in the crew cab too. Plenty of room for my tack with the seats folded up. Since I don't have a tack room in my trailer, a place for tack is important. My current truck is an extended cab, and that worked fine when it is just me and one horse. But often I am carrying a second horse and a second set of tack. Plus I want to be able to camp out again.
One of the major reasons I picked a Duramax over Dodge or Ford diesel is that both Dodge and Ford had an incredibly higher noise level in the cab and I hated that. I have all of my hearing, and I want to retain it. Also, I have cats, and I didn't want to subject my cats to deafening noise for hours if they had to ride in the truck. With gasoline engines, the difference was not so marked, but the Dodge still had a lot of transfer case and road noise that the Chevy didn't have. The last gasser Ford I drove was a '96, so that's too far back to be a valid data point. lol
re. the Chevy "work truck" feel, there is actually a "work truck" version in the gasser, and I hated everything about it. It rode rough, lacked the sound deadening of the higher level gassers and the Duramaxes, and the seats were hard and far less comfortable. A friend has a 2004 long bed extended cab Chevy 2500HD with the 6L gasoline engine and Allison transmission, and it is a wonderful truck, comfort-wise, for either local or long-distance drives. Quiet, smooth, doesn't beat you to death with truckishness. Historically, the 2500HD and 3500HD Chevys have always had softer springs than the 3/4T Fords and Dodges.
Extended cab vs. regular or crew: If you have or ever foresee having a gooseneck, you'd want the 8' bed. You can carefully pull one with a shorter bed, but it takes skill and diligence. (The friend with the 2500HD ext cab used to have short bed truck to pull his same gooseneck trailer. But he is a professional truck driver and can easily adapt to flaws and limitations of any setup.) But your problem with a 8' bed + extended cab is the truck is too long to fit into conventional parking spaces. The problem is even worse with a crew cab + 8' bed. If you are looking at short bed trucks, be sure to investigate fuel tank size on a short bed vs. what you'd get on a truck with 8' bed. I can drive a long ways on a tank with my Duramax, but my sister and nephew found they had to stop to refuel the shortbeds much more frequently.