If your talking about the movie, i havn't seen it, but you shouldv'e seen the fireworks in Entertainment District Arc from Demon Slayer and Akaza's backstory in Infinity Castle. Overall I disagree, I like Demon Slayer a bit more. Sounds like bias though, I love both.
I beleive Chainsaw Man can break into Japan's top 10 in the box office, but I don't think it can beat Demon Slayer. I do love Chainsaw Man, but the movie is shorter than Ininity Castle (obviosuly, Infinity Castle is 2hr 35mins!!!) AND Muden Train. It is also a lot less popluar, shorter, and just won't reach that level. And from what I can remember from watching Chainsaw Man, it was pure action besides Denji's backstory and his dreams to you know. Meanwhile Demon Slayer has action AND emotion. For the first time in my life I cried in theatre's and it was because of Akaza's (Hakuji's) backstory.