Out of the 19, which ones are your favorites and which ones do you think are hardest?
I've only listened to no. 3, 6, 9, 10, and countless variations on no. 2. Of those, no. 9, 10, and certain variations of 2 are probably the hardest. I'd say that my favorite of them (excluding the cadenza for no. 2) would probably be no. 3.
Thoughts?