Definitely Marvel. Thor has been a key figure in Marvel comics for a long time. His adventures and storylines are all part of the Marvel comic universe's rich tapestry.
Well, it seems that Marvel has indeed canceled the Thor comic. This could be because they wanted to focus on other characters or reimagine the Thor storyline in a different format in the future.
The number of Marvel comic heroes is constantly changing and growing. As of now, there are well over 8000 characters, but new ones are always being introduced.