I’m confused. Twinings is a brand, not a kind of tea.
But if you bought their English breakfast tea you are absolutely right that it declined. It used to be okay, and now it’s absolutely vile, even by English breakfast standards, which are extremely low.
Personally I tend to go for Darjeeling, Assam, or more rarely Ceylon. Which exact on depends on which exact brand I’m getting, and I sometimes have to change, because the brand changes quality. Like, with Twinings, their Darjeeling is currently a lot more palatable than their Assam (haven’t tried their Ceylon lately), whereas with the Marks & Spencer own-brand tea, their Assam is typically better than their slightly flavourless Darjeeling. Asda used to have an own-brand Assam (like, until earlier this year even), but it seems to have vanished - a real pity because it was extremely refreshing and had a lovely flavour.
I tend to avoid Yorkshire or English Breakfast, if I can, but if I can’t, Yorkshire > English Breakfast. I was raised to object to what my mother called “orange tea” (for the colour it went with milk in, i.e. orange rather than pale brown/fawn), though, so am permanently biased (countless utterly vile cups of tea from people who only drink Yorkshire or English Breakfast have helped maintain this conviction). Earl Grey is not great and kind of weird, but Lady Grey is unconscionable. I’d rather have hot water.
Of course I’m British barbarian who drinks tea with milk and sugar (albeit a very small amount of Silver Spoon “Half-Spoon” rather than real sugar these days), rather than plain, so probably should be ignored at all costs.