It depends upon the storyline. I like and dislike both categories depending upon how the story goes, the character development and the complexity.

For a solo movie to be good, the main character needs to be amazing. I think Marvel in their vastness of characters, only have a few that can carry a film or series of film and have a good rogue gallery to chooses from.

I also think that if you are trying to create this universe, it makes more sense that these heroes know each other, some start working together more often.

With that being said, I generally like the team up movies more, which doesn’t have to be a large team. I like seeing these characters interact and work together to solve a problem. It is nice to see these heroes fighting together and sometimes each other, like they did in the comics.

Depends but I say both

Honesty, I'll preferred Team movies seeing that most of the Solo movies from Marvel hasn't been good at all except for Iron Man 1, Captain Marvel, the two Black Panthers films, and First Avenger.

I don't really have a preference, TBH.

It's On the hero for the solo movies sames goes for The Team Up movies