As far as brand there isn't that much difference, often they come from the same tanks at the distribution center. Some do put in different additives but the gas itself is the same.
When it comes to what octane rating, that's a different story. You haven't said anything about your engine so it's hard to say. Unless your 454 is a very low compression truck engine you probably want to run 93 octane. That will allow you to run your ignition timing advanced for better performance and fuel economy.
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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