What is the best mission?

There is no one definitive answer to this question. Different people will have different opinions on what the best mission is. Some people may prefer missions that are focused on combat, while others may prefer missions that are more stealth-based. Some people may prefer missions that have a lot of exploration, while others may prefer missions that are more linear. Some people may prefer missions that tell a compelling narrative, while others may prefer missions that focus on providing a fun and challenging gameplay experience. Ultimately, the best mission is the one that you enjoy playing the most.