Any well-traveled gas station is fine with me, the large and always busy ones. I try to avoid small gas stations.. I use additives at regular intervals, so any high-volume is fine. The names are usually different, and I can't fill up at the same pump all the time, due to being everywhere.
And, most the time, 87 is fine. Haven't tried the 86 Economy grade that is in some spots. If higher octane is NEEDED as it is on some vehicles, then its best to use it, you gain fuel economy in those even if it doesn't knock and ping via retardation but you pay more for it so
I have found that using 87 on long highway trips in a car that needs premium gives rather horrible
fuel economy vs 93 and doing the exact same thing.
Simple math does dissuade me from buying 89 octane gas, except when money is dictating what happens.