I don't go by the name brand of the gasoline, but judge on the individual station itself.
Also I do not use a station with the selectable single pumps when I need premium fuel. I go to a station that has a pump for each grade of fuel. I have read the selectable pumps can give you as much as 5 gallons of whatever fuel was previously selected.

I used to fill up my daily at WaWa on Rt1 and Neabsco because they did alot of business. Although I found out their fuel is of poor quality because I get 4 more miles to the gallon filling up at the Sunoco at Dale Blvd and Minniville. I filled up with 87 at both stations and went back and forth a few times just to be sure. I consistently got better mileage filling up at Sunoco.