The third difference regarding which you have requested of me is that between the Deobandis and Barelwis, and you wanted to know which of these two are treading the path of Haqq.
To me the phrase “Deobandi-Barelwi difference” is surprising and odd. You have already heard that the difference between the Sunnis and Shiahs stemmed from the acceptance (of the one group) and rejection (by the other) of the Sahaabah-e-Kiraam (radhiAllaahu anhum) and that the difference between the Hanafis and Wahaabis originated from  the following or not of the Aimmah-e-Mujtahiddeen. However, according to my knowledge there is no sound basis for any difference between the Deobandis and Barelwis. The reason being that both these groups are passionate followers  of the Hanafi Math-hab. In so far as Aqaa`id both these groups accept and follow the teachings of Imaam Abul Hasan  Ash`ari and Imaam Abu Mansoor Maaturidi (rahmatullahi alaihima). Both these groups accept and take ba`it to all four Silsilahs of Tasawwuf, viz. Qaadiri, Chisti, Saharwardi and Naqshbandi.
In short, both these groups are in all respects followers of the Ahle Sunnah Wal Jamaat. They also acknowledge to and accept the reverence of the Sahaabah, Tabieen and Aimmah-e-Mujtahiddeen. They are Muqallids of Hadhrat Imaam Abu Hanifah (rahmatullahi alaih) and accept the authority right up to Mujaddid Alfe Thaani and Shah Abdul Azeez Muhaddith Dehlwi (rahmatullahi alaihima). They all also accept that being subservient to the Auliyaa of Allaah Ta`ala is the means of salvation in both the worlds. Therefore, in my opinion there is no real and genuine basis for any differences between theses two groups.

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