I stay loyal because they are the best!
I love Sainsburys and have been using them for pretty much all my adult life, having been raised on them too!
These days I use the online service weekly because I live rurally and it is cheaper and easier than heading to the nearest large supermarket.
The substitutions are few, the out of stock items are even fewer.
Nectar prices and special offers keep them competitive and the range is vast.
The fresh produce is always fresh. The shopping is always in good condition and the delivery drivers are such a nice bunch of folk, nothing is too much trouble.
I have used a couple of other supermarkets for online deliveries in the past, especially during covid lockdowns when online shopping slots were scarce.
But I have never had a positive experience, issues have included wrong items, missing items, badly packed goods that are damaged, defrosting and leaking goods, the list is endless!
But little to none of this happening with Sainsburys which is why I stay loyal.