I agree with @emjay82 that the franchises don't really have the quality of the product, to be frank the polished smiles, polished floors and pastries are all very well but it is us that pays for this stuff and we would all probably forsake this for better consistent service.
As regards product knowledge the fact is these places have huge turnover of sales people it's just a job to them, which is unfortunate to those other members of staff who are committed.
Personally I'm someone who is prepared to travel a bit for service and be firm fair and polite as to what I want and how I want it to be, there's enough of them about whether your car is under warranty or not, ah the joys of motoring 😂
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