I like Kerrygold, but the one available in Costco doesn't taste the same as the one I used to eat as a kid. I liked Anchor too when growing up, but that's changed too.

However, my favorite is the fresh butter we get on our family farm in Pakistan - it's made fresh every day and placed on the table just in time for breakfast (10-11 AM'ish). It looks like plain yoghurt or curd, but when you taste it, it's like the lightest but butteryest thing there is.