This is a post I'll come back to, but I'm going to make a rough attempt at ranking most of the big Chopin categories, so we can refer members to a useful thread instead of answering this once a week.(From easiest to hardest)Etudes:Group 1- Mostly slow: TN 1 and 2, Op 10/6, 10/3, 25/7Group 2- Difficult: 10/5, 10/9, 10/11, 25/2, 25/9, TN 3Group 3- Very Difficult: 10/4, 10/8, 10/12, 25/1, 25/3, 25/4, 25/5, 25/10, 25/12Group 4- Virtuosic: 10/1, 10/2, 10/7, 25/6, 25/8, 25/11More to come.
And I just can't agree with you that Ballade 2 is harder than #1. The musical challenged in #1 far, far, FAR, FAR outdo the minor technical challenges in #2. Not to mention the very difficult coda.
None of this adds much to the musical conception, so it feels like Chopin was throwing in all of those tricks just because he could.