Humm, difficult one. It really does depend on what it is and which supermarket it is from.
We only shop once a week (in theory if I can stop my OH from doing the 'I'm still on tour and have no fridge...' thing.
Veg - never basics range, but rarely organic either. I like veg with taste mostly because I used to grow most of my own before our world tour and would litterally pick it as I was about to use it. So we tend to buy the veg we know is good and more importantly will not go bad/off before we use it. We also get through a lot of veg, so it is important to us for flavour, taste and appeal.
Tins - well I don't tend to use them much, except tinned tomatoes and I prefer to have something nicer if possible. Acidic watery tinned tomatoes don't appeal to me, what is the point of then having to add tomato concentrate to them to get some flavour back & sugar to add the sweetness back?
Beans & pulses I cook from scratch, I can control the levels of salt (and exclude all sugar) that way.
Cereal/Oats - prefer the branded versions, not the value basics, but Sainbury's and Waitrose's own are fine.
Rice - prefer Tilda Basmati rice, usually pick it up in bulk when it is in offer in Morrison's or Tesco's... Last one was £6 for a 4kg bag.
Flour - prefer not to purchase the 50p for 1.5kg options, but won't buy the premium stuff unless it is something like spelt flour and then we buy it when it is on offer and stock up.
Meat/Fish - not an issue having been veggie for 29 years!
Mineral Water - don't buy it. Happy with tap water or what I get off a mountain.
But I won't buy Andrex toilet paper, kleenex tissues with aloe vera or etc... I stay with recycled stuff without further additives! Can't stand scented tissues...