It is, of course, common to warn people away from corporate chain operations and usually with good reason. However, most of those are franchises, so - in a sense - are locally owned shops. Its just that they’re locally owned inside of a basic corporate structure. (That can, on occasion, have its upside since you can go over people’s heads if you encounter problems).
There is a chain muffler/brake chain location near me that I happily use exactly because I know them to be honest. The same 1/2 dozen guys have been working there for as long as I’ve known them (over 10 years). If I use them I normally bring some work with me and wait there while they’re working on the car. Just about every time I’m there I see them doing the exact opposite of what many of these chains do - NOT selling people stuff that they could easily sell them. For example, I once watched one of their guys talk a customer out of a coolant system flush - simply because based on their records the car wasn’t nearly due for it yet. The customer was convinced that the cooling system needed service. The shop had the records of when they had done it the year before.
I brought them a flat tire once and they plugged it for free. I was doing an axle once and couldn’t bust the nut loose (broke a 1/2" breaker bar on it - guess its time to go to 3/4"). I drove it in to them and one of their guys put it on a lift, broke the nut loose, snugged it back down to get me back home, and again they charged me nothing.