Hi everyone!
I'm about to start studying a part from a Beethoven sonata, but of course as Beethoven wrote 32 sonatas it's a bit diffucult to choose. There are still the following options: part 1 from op 31 no 2, part 1 from op 31 no 3 or part 1 from op 90.
It's the first time I'll play a beethoven sonata but that doesn't meen it has to be easy

Please compare them.
Furthermore I am studying Chopin's 3rd Ballad but I've got some technical troubles with those rapid arpeggiated chords and octaves.
Can enybody give some advice how to study this part of that magnificent piece?