Is it harder to write corporate characters or creator owned stuff?
I think there are plusses and minuses to each. If you’re writing, say, Spider-Man, then you’re immediately starting with a lot of good will, with a character that a ton of people already love and are invested in. And also, the character’s world and behavior have been well-defined by a thousand previous stories. On the other hand, a completely new character in a completely new world starts from absolute zero, and it’s up to you to create that interest and connection on the part of the reader. On the other hand, with a new character you can go absolutely anywhere, whereas with an established character like Spider-Man, not only have a lot of things already been done, but there are a lot of things that that character simply would not do, which can limit things as well. But one isn’t better than the other, it’s just different.
