Grand Budapest Hotel is my favorite use of the tropes/style that he is known for. Royal Tenenbaums is the movie that really put him on the map, in my opinion (although I might be biased because that came out right when I was looking to expand my understand of what film could be).

And Moonrise Kingdom is personally my favorite of his films. I think it could be worth watching those 3, and then deciding if you want to go further.