Is “The difference in writing styles between Sima Qian and Ban Gu” true?

The Book of the Later Han, in the biography of Ban Biao, comments on the two: 'Qian's writing is straightforward and his facts are solid; Gu's writing is rich and his details are thorough.' This verdict exactly explains why the two books give different weight to the same person—the Records of the Grand Historian emphasizes narrative selection, while the Book of Han emphasizes material collection. Xiang Yu's downgrade from 'Basic Annals' to 'Biographies' and Jia Yi's upgrade from an attached biography to a separate volume are both results of this difference.