Because most things you get from Sainsburys are better than Tesco - I am racking my brain to think of anything from Tesco that is better than Sainsburys, but I am stumped. Tesco's problem is that although their food looks really good, it just never tastes as good as it looks and you always end up slightly disappointed. I live about the same distance from Tesco and Sainsbury, and tend to buy all my tins and things from Tesco then go to Sainsbury for Real food! My son who will not eat real potatoes, only instant mash, will only eat Sainsburys instant mash, not even any named brands, he can taste the difference (I recently tried it myself, and I have to say that he is right, it is very good for an instant mash)