Re: manga vs comics, I've said this before, but the biggest difference is in the adaptation pipeline,
When a manga gets adapted into an anime, you'll have people who read the manga already check it out because they want to see it animated, or anime only watchers who will read the manga because they want to get ahead on the story, so there's more synergy there.
When a comic book is adapted into a show or movie, the studios often take the IP and go in whatever direction they want with it--changing origins, completely different designs or characterizations, or the somebody just repurposing their rejected screenplay to fit the IP. Then the comics will often try to go back and change the characters to fit the movie or TV versions, but the two mediums are so different that it doesn't bring new readers in. We have generations of fans who love the MCU, Marvel Rivals, Teen Titans 2003, etc., who do not know or care anything about the comics.
Plus in Japan they have shyt like manga cafes, which would be unheard of in America for comics.