Well for me, I have played..........
Op 49 No 1 1st movement. Harder than it appears I think, I did it for Grade 5 and really enjoyed it. I have recently assigned it to a Grade6-7 pupil who seems to find it quite a challenge....... again, what one person finds hard.......
Sonata in D Op 28 2nd movement. I did this for Grade 7, very challenging to do well I think but lovely
Op 14 No 1 1st movement. I did this one for Grade 8, again a challenging work and probably not very well suited to those with small hands, many octaves and some chords greater than an octave
Pathetique........Hmmm, I did this for my DipABRSM which I failed......twice......you do the math!!

The LH tremolos in the first movement make me tremolo
And of course....Moonlight

I love this

The first movemt is beautiful but often played badly by people who think it is easy because it is slow

too loud, too fast, inappropriate balance etc...
The 3rd movement.........this is a work currently in progress......

One day I WILL master it
My goals with regards to Beethoven are ......
3rd movement Moonlight
Appassionata complete
Waldstein complete
Sonata in Ab Op 26 complete
Sonata in D minor Op 31 No 2 complete
Sonata............. hmmm,
ALL of them actually
I love Beethoven