If I am correct all the fuel is the same. It travels thru a large piple line from areas like texas to areas up here. They will pump a large quantity of gasoline for a while and then switch over to diesel all in the same pipe. It is at the distribution plants that gas or diesel becomes a certain name brand this is done by adding the special secret additives that each brand uses before it goes into a tanker to bring it to your local station. With all the different additives in gasoline such as clean valves from shell and clean injectors from another company youmay want to stick with one brand or another. with diesel they dont add all that crap so I think its basically the same. The main thing is turnover so you get fresh dry clean fuel. Also the pipeline is one of the problems with ethanol. Since ethanol hold water it becomes corrosive to the pipe and messes up the diesel and gas. Currently ethanol must be shipped by tanker which is why we dont see it up here in the north (no grain fields around)
kenny is right. Diesel fuel is a commodity. Asking which brand is best is like asking which brand or corn, rice, wheat, beans, strawberries, or pumpkins is best. Diesel fuel is refined crude oil.
Branding often occurs at the station that sells it retail. In some areas retailers all buy from the same distribution centers. In some areas the product may have been refined by Chevron, other area by Shell, etc. And occasionally, one big name retailer may actually be selling diesel fuel refined and distributed by another known brand name.
The main factors to consider when buying diesel are price and volume sold. If you always buy from high volume retailers like brand name truck stops you'll be almost assured of buying clean fuel. I've bought tens of thousands of gallons from Flying Js all over the US and Canada. I only buy from other retailers when a FJ is not available. I've never had an issue with dirty fuel.