Chofetz Chaim (of Brooklyn) is famed for it’s warmth and kesher to it’s talmidim, and the relation that a rebbi has with his talmud for many years. It focuses on Gemara and Mussar, and less on Chumash/Navi. They are less of the stereotypical Flatbush yeshiva, and more of a yeshiva in it’s “own category”. In Chofetz chaim ,there’s no Sephardi, Ashkenazi, Litvish, Flatbushish, Chassidish, or Heimish in Chofetz Chaim. CC is beyachad. They are a lifestyle, not a yeshiva. Ner Yisroel, on the flip side, is a mixed yeshiva with a very shtark alef shiur, and an OK lower shiur. The better boys often are from one of those yeshivas, but the CC bochur will maintain connection to his Rebbi forever, while as a Ner bochur may or may not.
HaMaiven Ya’aiven.