The dante is not near as technically difficult as the Liszt. As far as I know, it's not very challenging at all, for being Liszt - it you count in the different numbers of technical difficulties. The Dante has got loads and loads of octaves and repeated chords. So you get tired. Like "I just cam from the gym"-tired. But more than that, it's not like your fingers are running all the way up and down the keyboard.
I don't really know anything about the b minor. But it's considered very difficult.