The latter seems to be more reliable than the former, because the former was recorded in a historical source written in the Muromachi period while the latter was recorded in "Gukansho" (Jottings of a Fool) written by Jien, who was not only the almost contemporary person with Muneko but also the son of Tadamichi, in other words, Muneko's relative.
史料性としては、前者が室町時代期の作成であることに対し、後者の方はほぼ同時代人による記録で、ことに愚管抄の作者である慈円（忠通息）は育子の身内であった。