Lulu's is good in that you get a  wide variety  but the service offered is terrible .. the sales girls are surly, parking on the weekend is a hassle so for a few dirhams more Family Food Center is a much better option.. the veggies are fresher,  and staff are always willing to help.

Other options are Carrefour in Citicenter /Villagio or if youre looking for typically western foodstuff try Megamart or Qmart.