If you are coming in just for fun, bring a group of players that are great to work with and fun to have around. If you are seeking to Escape then you need to choose a team that you communicate well with. You will be working closely together to solve all the clues.
A good size group adds an advantage as you will have more people to assist. The more brain power you have next to you the better you will be. Each room allows for a certain amount of people, make sure to check the room descriptions to pick the one that is right for you.