Which one is better(more advanced): Chopin Waltz Op. 42 or Beethoven Sonata 7(1st movement)?

the chopin waltz and the beethoven sonata are about the same technical difficulty. if anything, the beethoven is slightly more technically challenging. chopin will almost always be more complicated to interpret though. in terms of which is more fun, it all depends on your individual taste. personally, i think anything by chopin is more fun to play than anything by beethoven, but that's just me. as for beethoven's 6th sonata, i haven't played that one so its hard to say.