I shop at Tesco as its the nearest but I wish I could afford to shop at M&S or Waitrose. Or even Sainsbury's for that matter. I do have a Sainsbury's near me.
If only going out for food shopping; Asda. If I am driving home from the city; drop in to Sainsbury. Run outs and it's the local coop. When I can be bothered I am going to find my nearest Tesco, which I always used before I moved and their clubcard points are the best. Virtually got a free holiday with them last year ....
I think they are all have their good and bad points. The good thing about a regular haunt is you can zip round on auto pilot.
Co-op are doing Terry's All Gold half-price at the moment, get down there sharpish ! I have 4 boxes (so far), can only carry 2 at a time in my rucksack.