Blu-ray Movie Collections

[Blu-ray1]

When you buy a movie collection, like these for example:

https://www.blu-ray.com/movies/Rambo...Blu-ray/12553/
https://www.blu-ray.com/movies/Rocky...-Blu-ray/6784/
https://www.blu-ray.com/movies/The-G...-Blu-ray/1003/

Do you prefer that each movie come in a seperate case, do you like having all the movies in one case, or do you not care either way? I prefer that a collection come with a seperate case for every movie. If i can i'd rather buy them separately, but the problem sometimes a collection includes extras and other things not available in the individual releases.