Best bird seed?

Hello everyone, its been a while! I wanted to get some opinions on what people think is the best bird seed. I've just finished a bag of nature's feast high energy supreme, which whilst expensive did go down a lot better than the stuff from Poundland. There's so many different kinds/brands though its a bit confusing. I get blackbirds, robins, LLT, blue/great tits as regulars (plus the usual wood pigeons/squirrels).