your case does not hold.
unless the company is generous enough to put u also into the presidential suite, then definitely the quality. this is what james bond has chosen.

otherwise, a st. regis is jsut as good in quality and also offers points. for the same corporate policy, i can get a club suite in st. regis vs. a club room in ritz carlton; and the persidential suite in st. regis vs a diplomat suite in a boutique hotel.
and i get points and exceptional service as well!
also, sometimes it is not the service itself, it is also the status and the fact that they treat me better than other guest. e.g. priority/guaranteed reservation is nothing your boutique hotel can beat.
again, james bond does not care because he can always jump the reservation queue.