I get a proportion of my salary paid in John Lewis vouchers in a salary sacrifice scheme so do the bulk in Waitrose. Day to day extras and treats/ready meals will be from M&S. Once a month or so will do a major shop in Costco to stock up on nappies and wipes, stuff for the freezer, tins/cans, cooking oils, alcohol, household stuff (loo roll, kitchen wipes, tissues etc.), cleaning supplies and so on.
Went to ASDA last week and was quite impressed with how cheap it was and the general good quality of the food in there. Use Tesco to stock up on food for the office, cereal, milk, fruit, snacks etc.
Have been to
Morrisons but was appalled at the kind of people in there and the overall experience was horrific, frustrating and intimidating. Never been to an Aldo/Netto etc.