So far I've had/tried all Hifiman cards: balanced, IEM, Minibox, classic, classic II, AD8397, and the new discrete card, I enjoy new discrete card the most, especially with headphones like RS1, ED8 and even the HE560. It gives out more juice even than the balanced card in balanced mode (I've had balanced cables/plugs for all these three headphones), and it has better extensions in high and low frequencies. The balanced card sounds a bit dry and dull compared with the new discrete card.
My previous favorite card was the Minibox, yes, I liked it more than the balanced card. Now I only use the new discrete card :)