It’s always worth experimenting. Go down the ladder — branded, premium own-brand, regular own-brand, basics/value — until you hit “unacceptable”, go back one, buy that one in future 🙂
We get a mixture of branded/own-brand/basics stuff. Sometimes it makes a difference, sometimes it doesn’t. Never found any pattern to it — own-brand washing up liquid always seems a bit rubbish, own-brand dishwasher tablets work fine.
I don’t think I’ll ever buy branded breakfast cereal again, though.