I would choose Matrix Organization for a startup medical device company that will function worldwide because of its flexibility to drawing employees from different functional disciplines for assignment to a team without removing them from their respective positions. It is good in terms of large and long time projects management. Employees in a matrix organization report on day-to-day performance to the project or product manager whose authority flows sideways across departmental boundaries.
Matrix organization is also have good management of resources, no department or project silos and knowledge transfers well from project to project and between departments.