YBA Passion vs YBA integre dt integrated????

I'm considering a new amp to push my JM Lab Micro Utopias. I heard YBA matches very well with JM Lab product. I heard at CES the demo of their new Utopia's was done with the Passion integrated amp. This speaks alot to their confidence in this product. Is it worth the difference in price or is the smaller integrated adequate? How do the YBA integrateds compare to the Plinius 8200 integrated?