At home I'll usually shop at Aldi or Morrisons because there closest. At uni I'll generally shop at ASDA because they're the only big supermarket, the other nearest shops are two bus rides away
LIDL or ASDA. I'm spoilt for choice, but I'll never bother with Tesco because they don't really excel at anything in particular. LIDL and ASDA are both reasonably affordable, and they have a lot of variety.