I'm not sure if there is a best diesel fuel brand. But two things can make any diesel fuel stop high quality.
1. Turnover rate - if a lot of people are getting diesel there or there is a lot of diesel being pumped into tanks all the time, then it is likely a place with fresh diesel. Which is why I prefer to fill up at trucker stops.
2. Cetane rating - Minimum cetane level is 40. Personally for me, at 40 cetane my car has worse mileage and it rolls some coal at wide open throttle. When I filled up with 50 cetane fuel WOT the smoke was gone, there was smoother idle and the mileage increased.

With that being said, the best place is in Windsor VA for me. It's a trucker stop called Souther States Fuel. Only gripe is that it's over an hour drive out. And over an hour back so it's not the most economically feasible option for me.

The fuel that is close to me is crap. All 40 cetane stickered on the pump. Some don't even have a sticker indicating cetane rating. There is one exception. There is a Quarrels Fleet Fuel located near me with a cetane rating of 47 IIRC, but they have a monthly membership fee of $30 dollars. Not economically sound imo.

With all things considered I have resorted to going to a shell trucker stop with 40 on the pump. Car runs fine with it. If I give it WaWa or any other rinky dink place with low turnover diesel my 300SDL bucks like a mad horse when cold! I mean to the point where you can visually see the car shaking and bucking, and the idle is horrendously rough, not to mention the white haze of unburnt fuel that ensues the area shortly after.

Just my anecdote about diesel fuel.

__________________
1998 Ford Escort ZX2 5 speed - 279,000 miles My Daily

1992 Mercedes 300D 2.5 202,000 - Pure junk
2000 Mercedes E320 Black - 136,000 miles - Needs repair

Don't forget to grease the screw and threads on the spring compressor.