Sainsburys.
The one near me is large, tends to be well stocked, has wide aisles. I think Sainsburys is pretty competitive on price these days and it always has good offers. Of the big 4 I think it also has the best wine selection. The nearest ASDA is very small, has narrow aisles but is always very busy and can be a pain to get around; there is another bigger one a bit further away but it's dirty, tends to be poorly stocked and is always full of chavs. The nearest Tesco is about 20miles away. I've only been to the nearby Morrisons a few times, just doesn't seem to have the things I want.