I usually use BP, for the rebate we get on our Chase BP card.
Some Speedway stations are cheaper, where they offer .05/gal off with their rewards card, so I use them sometimes. Also use Kroger, to take advantage of the amount off per gallon with their card.
I doubt that it much matters.
I run a fuel system cleaner containing PEA at least once a year in each car, and I've always thought that "Top Tier" was no more than a marketing program.