I notice a fair number of comments that Herzogenberg's music is undistinguished or unremarkable. I have trouble relating that to my experience, listening to Herzogenberg's first symphony, which I would put in the first rank among "obscure" composers.
Although it is not uncommon to see composers of the late 19th century compared to Brahms, often the real meaning is that they are not in the opposing Wagner/Liszt camp. Herzogenberg is one of the few that I would consider a true Brahmsian, in that his music eschews broad tunes and theatrics in favor of symphonic logic, motific development, and harmonies which seem to blend light and darkness (major/minor) in an organic way.
In the first symphony, I was impressed with the stark chords that opened the slow introduction, which continued with development of a rhythmic/melodic motif through many harmonic contexts and transformations. The following allegro seems to grow organically from the introduction, and in the coda comes to an apothesis which forshadows (for me) the coda of the first movement of Brahms' forth symphony. Another wonderful bit of magic in the piece is the central section of the second (nominally slow) movement. It is a delicate bit of work which seems to be simultaneously quietly joyful and sad. I thought only Brahms could pull that sort of thing off with such success. The tense, intermezzo/scherzo leads to a finale which perhaps evokes the mood of Brahms' first symphony finale, and comes to a suitably uplifting conclusion.
I am looking forward to hearing more from this composer (so far this is the first work I have listened to).