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Any of the major stations or unbranded stations using Top Tier gas will be fine...you won’t notice a difference. It’s largely all coming from the same storage terminals anyway...branded additives are added to the fuel as it’s loaded from the bulk tanks into the delivery trucks.
We use mostly Quick Trip, either regular or mid-grade. Never had a problem with either octane, although I top it off with premium if I'm planning on using the right pedal a lot.
Shell has been the best in my mustang. Knock sensors often add timing with Shell's 91 V-power but pull timing with Chevron's 94 octane according to my data logs.
Shell's 91 octane in Canada has the same RON octane number (99 RON) as shell's 93 in the states does.