No. 2 has some LH stretches that are awkward for a small hand... just a consideration.
I haven't learnt the first scherzo seriously, but I've had a bash through it and I think it is much harder than the third ballade.
They're all so difficult that it's hard (if not impossible) to actually rank their difficulties.
1. My teacher would just null - in - void anything I picked that was too challenging, so I'm trying to step into these big pieces in a logical way. I think she was already a bit sketchy about me trying the scherzo.
2. The reason she would null - in - void it, is this is part of an exam repertoire and I'm aiming for 90% or higher if possible on it (like she got) and you can fail if your technique is not up to the par of the pieces you choose.
3. I already am just starting a Bach Prelude and Fugue, entire Schubert Sonata (though a shorter one albeit), Rachmaninoff Prelude, Bartok dance, and Un Sospiro, so I must be careful to pick something that still leaves me plenty of time to learn all this other exam repertoire.
4. My goal is to have it all up to concert standard in just over a year (maybe a year and a half) and then audition for university, so I'm under a bit of a deadline to start, learn, and finish it all.
There's a topic on this somewhere where Bernhard gives his ranking. I don't quite remember it, but I remember it being somewhat similar to my own, so I'll give that and leave the searching up to you:1. Scherzo No. 22. Scherzo No. 33. Scherzo No. 14. Ballade No. 35. Scherzo No. 46. Ballade No. 17. Ballade No. 28. Ballade No. 4
I'd respectfully disagree with this ranking. Having played all of those at some points of my life, I'd say Scherzo No.4 is BY FAR more difficult than even Ballade No.4 both, technically and musically.
Oh in my opinion 'easy' scherzo is scherzo no. 1. Many people play this piece and very often it is the first scherzo in pianist's life. No. 3 is quite difficult, but I think and for me no. 3 is less difficult than no. 2. yeah it is only my opinion but the final in scherzo 3 isn't very knotty, and if you like octaves it will be very nice experience. 4 isn't very difficult technically but musically yes. If you like challenges pick 2 or 3 scherzo. I recommend Pogorelich's performance from Chopin Piano Competition - Scherzo no. 3 , and no. 2 - Martha Argerich, Sviatoslav Richter.