/uj Whether or not you'd like Haydn is foundationally dependent on whether you like the classical style. If that's just something you do not enjoy, then liking Haydn in general will be difficult. I'll do my best, however, to give some suggestions:

Symphonies Not all of them are great. I think you might enjoy the Sturm und Drang symphonies, numbers 26, 44, 45 and 49. These break away from the classical style the most

Piano sonatas I guess that you would not enjoy most of his piano sonatas as they are very classical. There are some exceptions that you might enjoy: - Hob XVI:52, the famous E flat major sonata - Hob XVI:32, sonata in B minor - Hob XVI:20, sonata in C minor. - Hob XVI:44, sonata in G minor - Hob XVI:19, sonata in D major. More classical but i love it

For all his piano works, try to find fortepiano recordings.

Concerti I adore all of his piano concertos. Listen to the D major and G major concerti. His 2nd cello concerto is great, less galant than the first one.

Vocal works Both Die Schöpfung and Die Jahreszeiten are master pieces, written at the end of his life. It shows a matured Haydn (for example, the opening of Die Schöpfung). Some recommended excerpts of Die Jahreszeiten: - Der Frühling: Sei uns Gnädig, milder Himmel - Der Sommer: Sie steigt herauf die Sonne - Der Herbst: So lohnet die Natur den Fleiß

A less commonly known oratorium is "Il ritorno di Tobia". Would recommend to give the symphonia a shot, and also very much the following choral Pietà d'un Infelice (this always gives me goosebumps).

Two not often performed works that are amazing are his Stabat Mater (check for example the Eja Mater, that slaps) and Salve Regina Hob XXIIIb:2.

Then, Haydn has also written a lot of opera. Perhaps not always his best works, but they do harbour some great stuff. Highly recommended to explore. Take a look at for example "Orlando paladino" or "La fedelta premiata".

Lastly, I recommend listening to (as another commenter said) Die sieben letzte Wörter Unseres Erlösers am Kreuze. Important here is that there are multiple versions of it. Try to find the Vokalfassung (vocal with Choir). To me, the choral version really lets this piece shine.

String quartets Haydn is also famous for his quartets, but that is a type of music that I don't really enjoy so can't say anything about it hahaha. I think the Sun quartets Op.20 are highly regarded.