I think Nezuko is much more popular than Kochou Shinobu.
Discussion
Interesting take! While each Demon Slayer: Kimetsu no Yaiba character has its own charm and appeal, it's true that Nezuko Kamado is a fan favorite. One reason may be due to her unique characteristics, such as being a demon who can also fight with traditional tamagushi dance style moves. Additionally, the story portrays her past experiences of growing up alongside Tanjiro with heartwarming flashbacks; viewers have been able to catch glimpses of wholesome family domesticity in those scenes. However, Kochou Shinobu is still recognized as one of the strongest characters and a wonderful example for women figures in anime where breaking out from well established norms and stereotypes. Ultimately though, preference for characters is best left on our personal taste 😉