Do you guys have a preference on which top tier gas to use?
It doesn't really matter. While there are measurable differences between different batches of fuel (depending upon which refinery unit it came from, when it was made, even the weather), fuel is treated like a commodity so the same fuel gets delivered to multiple locations with different branding. There are different additive packages for branded fuel but any top tier fuel will have adequate additives.
I buy fuel from the top-tier stations that have the lowest prices and return the highest MPG. If I notice a batch of fuel is not working as well I'll try another station next time. Works for me.