The Waitroses near me have better lighting (no migraines like in Tesco or Asda) and nowhere near as many mountains of shite at the end and middle of every bloody row and obscuring the gap where you line up at the till like Sainsbury's.
I can get ingredients there, rather than be assailed by 20,000 SPECIAL OFFER processed packets before I reach the meat. There's no being diverted around cards, toys, cosmetics and any random shit (barbeque briquettes in January, anyone?) they hope to punt out before you catch a glimpse of a potato.
The plants and flowers are generally alive. Unlike Morrisons'. Sainsbury's ones aren't bad if they've got a special deal on, though.
If you want microwave dinners, they're easy enough to find, but you don't have to go past three aisles of the things before your first lamb chop.
You can get some ridiculously wanky things, but you can also get some interesting things to try without having to know about them in advance. It's easy to find things to accommodate allergies and intolerances.
The sushi/sashimi is better quality than the vague approximations at rice and a cube of cucumber that Tesco sell, and you can actually get edible sashimi, rather than everything labelled NO RAW FISH as though that's the most terrifying thing in the world for an M&S customer.
They do perfectly good own brand products as well as standard brands and wanky posh ones on almost everything.
Blue eggs. Yeah, they look great on the windowsill, but they also happen to taste much nicer - the only eggs that were ever comparable in flavour were Sainsbury's Organic. And duck eggs are easy to find 90% of the year.
Most of my adult life was spent buying from a largish Sainsbury's in a vaguely MC residential area, but I'm nearer to Waitroses now - and, given the choice of one of those or the out of town ASDA, a Sainsbury's, Tesco's (shudder, unpleasant migraines every time) or the Morrisons with loads of packets and a few slightly dodgy fresh items, well, Waitrose wins. I'm also significantly less likely to come back from there with an electric steamer, a novelty lampshade, three cushions and a new pillow that'll last a fortnight before collapsing like a pancake.