I think the manager needs to be good at communicating. Their interpersonal skill should be sharp enough because they are in charge of the decision-making process. So, they have to be talking a lot with different departments and personnel in higher positions. Also, they definitely need to know the technical skill but they don't need to perfect them, they just need to understand what is going on so they can make better choices for the benefit of the project. 

I agree with @vv48 in saying that it is more important for the manager to be better at communicating than the technical skills because they are overseeing several different teams which require different approaches when managing them. Some teams can have more flexibility in terms of their work compared to others that need to follow stringent guidelines as per company's policy and protocols. Not only is the project manager leading different teams they are also responsible for communicating with their own managers and supervisors on the progress of the team. If their higher ups are not pleased with the the PM's teams' performance that burden falls on the PM and it is their responsibility to improve the team's performance without compromising their morale. The PM needs to make sure that the team is performing at the highest level and that can only happen if the team is motivated to do the best job that they can. A team will not put their best effort into their task if they are constantly resenting what they are doing so it is the responsibility for the manager to be able to communicate what the higher ups want for the project  while keeping the team motivated and on task.

The best project managers should be good communicators, and that should be their most important characteristic. Technical skills could be beneficial as a manager to help with the project, but in order to effectively lead a team and a project, leadership skills are required. One of the most important leadership skills is the ability to communicate with a team. Good communication will ensure that the project scope is clearly relayed to the team. Additionally, different updates and issues that arise should be communicated throughout the duration of the project in order to allow for the team to be able to adapt to the changes in the project. Communication is also crucial in scenarios where you are working with an individual rather than a team. For example, in a performance review, a project manager should be able to effectively inform the team member of how their performance has been and whether there are any issues/problems that need to be resolved. When problems break out in the workplace, the project manager should be able to settle any issues and clearly communicate a resolution to the rest of the team. Communication is more important than technical skills because if a project manager has good communication skills, they will be able to lead a team across many different industries. If a project manager has better technical skills, they may have trouble leading a team and would only be able to work in specific industries. 

Project managers need both technical and communication skills to be successful leaders within a group. For someone to possess technical skills, they must be able to apply specialized knowledge and expertise to complete specific tasks. Communication skills refer to the ability to effectively communicate with team members and stakeholders so that everyone understands the goals and deadlines of the project. When project managers have good communication skills they will also have the ability to manage any conflicts and ensure the project is on track to finish and be successful. In a lot of companies, they have specific people in charge of solely keeping clients happy, while also relaying information so that they keep their business. Maintaining a relationship with both sides helps the project run smoothly. Overall, project managers should use both their technical skills and communication skills to create the best environment for the team members, suppliers, investors, and/or clients. Technical skills and communication skills come hand-in-hand and if you do not have one of them then it could be detrimental to the project.