Which is the best value large shop in the uk?

Im a creature of habit im also disabled with no car so I basically just get asda delivery every two weeks where I mostly buy asda own brand , on Friday I have to go to the doctors where ill pass an Iceland and a small farmfoods (only has 2 isles) im also not that far from a large food warehouse where I live and im debating on if I should push myself to go there (walking with a shopping trolley) if it has good savings.

I know Iceland delivers but I recently tried to do a sainsbury delivery to compare to asda and I just got too frustrated with the process and gave up, on asda I just go to my favourites list and its so easy to just add them rather than starting fresh somewhere else.

so will it be worth me going to Iceland this week or just sticking with asda im assuming im still going to have to do an asda shop too as Iceland wont have much fresh although its £40 min for delivery. I have separate full sized fridge/freezer so I can stock up as much as budget allows. id rather not go in any shops I have severe anxiety and im practically housebound but also on a budget on disability so should I start splitting my shop or sticking with asda?