I shop locally by bike so go to whatever is there. Which is Mozzers, Lidl, Iceland and local shops for local people. Prefer to buy locally sourced farm produce and often do, especially eggs and veg.
Super tasty tomatoes from the farmer’s market at the weekend were the same price as the mid-priced tasteless supermarket red spheres of water. Bet they bought them from Lidl and brown-bagged ’em up 😉
PS any kind of supermarket snobbery is w*nk IMHO. They are most all unethical and unsustainable anyway so who cares whether you shop at Waitrose or Iceland? Unless you think it’s some kind of social status symbol, in which case my condolences.