Why is Nobunaga more popular than Musashi in anime?
Musashi was a faggot.
Not just in anime.
Miyamoto Musashi got a good deal of popularity in the west thanks to Vagabond, but in Asia, there's lots of more popular people from the past.
Nobunaga: Genius warlord that was on the verge of conquering Japan. Great modernizer, would likely make Japan keep up with the west.
Musashi: swordsman that participated in a few duels, but never against the best of his era. His most famous duel may never have happened and was against a relatively unknown person before the duel.