The infographic supports the story you want to tell. With an infographic you can tell the story, the nuances and the emphasis yourself. An infographic works well as a start of a conversation, for example.
A whiteboard video tells one clear message and is more stand-alone. A video is easy to send or to put independently on a platform.
Our experience is that you usually know what best suits your situation, but we can always think along with you if you are in doubt!