Between bp, conocophillips, exxonmobil, shell, and chevron, who sells the best supreme gas? i normally only?

buy from chevron and shell because their supreme gas has additives that clean my car's engine, but what about bp, conocophillips, and exxonmobil, what about their supreme gases? are all the supreme gas sold by these five supermajors the same or are only chevron and shell selling supreme gas that has additives that clean engines.............?