I got tired if going through the useless replies but I would recommend GM.For me, it's either the Ford or the Dodge, with GM/Chevy far behind. Not to say there's anything wrong with GM, more preference than anything. You brought up a good point, JH. Whoever has the best deal at the time will have an advantage. That being said, you can't really go too wrong with any of them, I guess.
I have owned both the Ford and the GM and find the GM to be a smoother ride as the long wheel base in the ford makes for a rough ride. It's minor but filling the DEF in the Ford is a pain, the GM has a better engine brake with a load and despite the Ford feeling more powerful off the line the GM hauls better at all speeds. If you we're to work on it the GM is much easier as the Fords you basically need to remove the van for anything serious. This is all based on the 2010 years and above.
Pre 2010 in the Fords I've had trouble with the trans and always had a bad idle due to the egr. Dodge would be best bang for the buck but I would still go with GM just for styling.