Any of them seem movie worthy?
Ground Zero is probably the one you'd use if you want to show off the Leader as a credible threat, and could be handled pretty cool as a by the books, Hulk vs the Leader film would go. I don't think it would be overly hard to adapt into film.
The Brute That Shouted Love At the Heart of an Atom is a very heavy Science Fiction, tragic romance story that could kind of work in a more morose way. It has action and adventure, and ties into subatomic particles, so that could help connect with the likes of Ant Man. Though the ending is very sad and might not fully work in a MCU film, CGI would also be an issue.
Future Imperfect could probably be done as a blockbuster movie, with rewrites to include more Banner. It's intelligent, has a lot of action, cool set pieces and really unique villain. I think it could be doable with the right hands.
Pantheon is kind of more traditional superhero, with Hulk joining a team of demigods. Again, with rewrites it could maybe work out as a fun film, it connects to Thor and the Asgardian characters as well, so that could be another element they could play up.
The End is probably not film material. It's Bruce Banner and the Hulk after the rest of the world has been destroyed by nuclear war and is mostly the two characters struggling in a hellish situation. In a dream world, maybe it could be done, but its not a franchise thing and probably wouldn't appeal to the masses.
Crossroads...that's a personal favorite of mine, but it'd be a weird ass movie. Hulk goes on a rampage, reduced to a completely animalistic state with Banner deeply repressed and not even the Avengers could stop him. Dr Strange basically dumps him into the Crossroads of reality, a strange intradimensional place where Hulk is constantly being thrown from one world to another, getting involved in various lives of the different people's across reality. Along the way we get a slow and deep look at who the Hulk is and how exactly he came into being. It'd be very tricky to adapt into a film, and would probably have to be a Hulk/Dr Strange team up story, and it's budget would be massive given the material. Maybe if they took the same kind of liberties that they took with Cap and the Winter Soldier storyline then it might work out.
I think he has a lot of great stories, some that are told very cinematically, but the problem is that they focus on Hulk a lot, which is something that would eat up the budget.