I have had only the experience with working with only one manager. With one manager, it is easier to be on the same page and easier to communicate with. If you are struggling with something, you can get help from them. But when you have two managers, both of them might suggest something different and can cause conflicts on how to handle the projects. But on the other hand, having two managers might come in handy when one has more experience in a certain field compared to the other one. If the project is a big one with a short deadline, it maybe useful to have two managers so that the work can be split up and have less stress for everyone working on the project. So having one or two managers depends entirely on the size of the project and the type of the project also.