Dubliner vs Ballyshannon
I've gone back and forth between both but in my mind Dubliner is the victor. I love both but I think Dubliner has much more character. Now I have yet to taste a better butter than Kerrygold(salted or unsalted).
Dubliner is my favorite too, although I do like the ballyshannon and the blarneycastle as close seconds.
Oh, and their garlic and herb butter...makes everything better