Sainsbury's is the default for a weekly shop, just because it's generally just about okay for everything, i.e. price is okay, choice is wide enough, and it's not too far away. The covid controls have been pretty good. (Interestingly that's actually become a really key driver in which supermarkets I use).
The Morrison's near me is good for some things, so I go there a bit - There are big Korean and Indian diasporas around that branch and so the Asian foods bit is really good, kimchi, gojuchang chilli paste, all the spices, just things you can't get in other supermarkets, it's fab. The rest of it's a bit cheap and nasty and their covid controls have been poor, so I only go when it's quiet.
I like Waitrose and M+S sometimes, when I'm feeling flush and want to treat myself.
The Aldi and Lidl branches near me I don't quite get the love for. They don't have much choice at all, and I couldn't do a week's shopping there and not have a mutiny at home.
The two nearest Asda and Tesco branches near me are absolute magnets for mouth breathing "I'm exempt mate" types, reaching over you, eating food as they go round. Social distancing this year (at both) has been non-existent and I avoid them.