When I was looking at a questionnaire about ADHD I showed out to my wife saying something like "man, they're really gearing these questions to diagnose everyone with ADHD, aren't they?" She read through the list and then, with the saddest expression I've ever seen on her face, looked at me and asked "you mean you've been struggling with all of this?"
Getting diagnosed was a formality after that.
I don't think it's that the draw for hulk is lower, but there are legal issues. If I remember correctly, Universal owns the distribution rights for solo Hulk movies, so Disney doesn't want to release any and instead just include him and his related characters in other movies.