Look at the bottom of the receipt.
I only use Chevron, shell uses more water.
The ONE time I didn't use shell recently and used a small mom and pop place my car ran like crap to the point the car would nearly die. I took the fuel filter off and primed the fuel pump a few times, all kinds of water came out, and when I flushed the filter backwards small rust particles came out. Shell only for me, NEVER had a problem with it in many years.