I use different shops for different occasional items @ht80. Sainsbury's, Lidl, Morrisons and Asda - but the main bulk of our shopping comes delivered by Tesco, because I tried several of them and Tesco were by far the best for delivery - Sainsbury's definitely the worst ! As for price, not much to choose - they all have special offers on some things, but in our area at least, Lidl is probably cheapest.
Depends on the store!
Aldi and lidl are terrible for fruit and veg mostly.tesco and asda are cheap overall with good quality fruit and veg .
Iceland is ok but not for a major shop just small amounts.
Near me we have what was not sure I'd still is but the biggest Asda in uk, but I used it only twice as it's too much in my opinion 🙄 cheap though