@gavra_at_work Probably the biggest difference (and most critical) is that they believe in a hereditary system of leaders, and those leaders are the conduit through which they serve the RBSO. A corollary to that point is that what the Rebbe says is law from the RBSO, similar to as if a Navi said it.
That was a very inaccurate statement and nothing like the reality.
Chassidim hold in asay lchah rav as it should be held. That you don’t just go to a rov for kashrus shallos or when it’s convenient, or when he’ll give you an answer that you want. If a (true) chossid was wondering if he’s allowed a smartphone for work, he’d (1) ask the rebbe (2) listen to what the rebbe said, no ifs no buts. How many non-chassidim can say they’d even do (1), let alone (2)? It’s not an exclusively chassidish shitta (e.g. Rav Dessler says the same thing), merely one aspect of Yiddishkeit that they are very strong in.
They also understand the true stength of a kehillah and its mesorah (which can evolve as a whole, but from which one should not separate) from which we in the rest of modern (small M) Orthodoxy can all learn.
To say they hold the rov’s rulings comparable to nevius is utterly wrong. (I assume you know what nevius is.) Similarly, your statement that “those leaders are the conduit through which they serve the RBSO”.