I usually shop at Asda, more a force of habbit than anything as my parents took me up to Asda Jewel as a child every Sunday and I've kinda followed that tradition. Anyway I got home from Asda tonight (after my shift at Tesco)
On the flip side, Tesco's online delivery service is far more superior to Asda or Sainsburys' and I'm not putting a bias spin on this because I happen to delivery part time. Tesco.com have larger vans that you do not climb into to retrieve customer's shopping, thus meaning Tesco vans hold a lot more shopping, therefore have more time slots. We also have a more stores covering Edinburgh and I would imagine throughout the UK in most places. A lot of customers have told me they have tried the rivals and not found there services that good compared to Tesco.
Tesco also have a better rate of pay than Asda and have a simpler recruitment procedures. Asda have 3 stages. Application form, Group interview, formal interview. Tesco just have the application form then interview. However Asda give employees 20% off after 3 months, Tesco give you 10% after a year. plus shares. I'm not sure if Asda offer shares after a years service?
Anyhoo, just thought I'd give you my ten pence worth on my views of Asda and Tesco. I've kind of excluded Morrisons and Sainsburys as I dont really shop at those two and when I have I've found them dearer, However Sainsburys' fruit and veg is top notch!