I understand that you want to know what the best brand of gas is. I have taken some time to research your question and came across this great link that can help you out. I attached the link below for you to view. I hope the link that I provided is helpful.
Different brands offer different types of additives to improve the performance of your vehicle. I would definitely look into your vehicles owner's manual to see what type octane is needed. Another suggestion would be contacting consumer reports to see what brand is recommended for your vehicle.
I provided you with a few sources to look into below.