Reply To: How come all frum Jews today aren’t Chassidic?

Joy in avodas Hashem is not exclusive to Chasidim. Litvish Jews also grow up loving and enjoying the Torah. Ever see Simchas Torah in a litvish yeshiva? Nor do Chabad have an exclusive on chasidus. My husband and I once went thru the alphabet and we came up with several names of chasidus sects for practically every letter (ok, maybe not Q or X).
This is probably very simplistic, but I would say the differences are that chasidus has more of an outward show of that joy, an emphasis on avoda and kedusha, and the centrality of a Rebbe to channel/develop a person’s avoda. Litvish traditionally placed more of an emphasis on Torah learning, the Rav is a teacher of Torah and a guide in Halacha and Hashkafa, but is not needed for an individual to get close to Hashem.
Most Litvish people I know would never consider becoming Chasidish, and vice-versa. Of course, FFB don’t usually choose their derech, but follow more or less what their families/communities do. So while certain chasidish sects are very appealing to Baalei teshuva, you don’t see significant movement towards them from other frum streams.
That said, the line have blurred significantly in the past few generations. Many chasidus streams are very into Torah learning, and many Litvish people treat their Rabbanim the way chasidim treat their Rebbes. I would dare to say that both movements have gained from the others.