Ocado is far faster to build up a week’s shopping, we handle this extremely quickly.
Where Ocado has the advantage is, when you type an item in the search box, the item comes up and the search box then empties for when you type in the next item. You then buy the item and the search box is free to type in the next item.
With Amazon, one types in the item as in Ocado, and then you buy your choice of product, but when you come to put in the next item, you have to delete the old item from the search box. Apart from this taking extra time, it is extremely annoying.
This is why I will never use Amazon for my weekly grocery shop.
I have been a Prime member of Amazon since the millennium bug was found to be non-existent (2000AD) and buy between two and five items a week from them. And will continue to do so but, alas, they won’t get my weekly grocery shop.