Even though I learned a lot of very great lessons from the teachings of Rav Nahman of Breslov still I have to admit that the only way to get to the pure essence of Torah is through the Gra [Rav Eliyahu the Gaon of Vilna]. And you can see this yourself any time you talk to anyone in Breslov. When anyone in Breslov wants to show that so and so is a great Torah scholar, they never say "he is so great and you know this because he learned in a  Breslov yeshiva". Rather they say "he is a great Torah scholar, and you know this to be so because he learned in the Mir." [Or they say it in present tense as in reference to people that are at present in the Mir either in the Mir in NY or the Mir in Israel.]