I probably couldn't pick a favorite as I deal with a number of local shops depending on what I'm looking for, what they have, at what price.
I could easily pick my non-favorite shops but a lot of them have self regulated so have either gone out of business or now have new owners.
Some shops I do have my favorite counter person or persons as once I get to know someone they are easier to work with & seem more willing to be honest & fair with me.