Video is usually more effective for asynchronous presentations. Powerpoint is great for spoken presentations where everyone is in the same room. But they generally suck as summary reports. For thinking and analysis word docs are superior. For asynchronous presentation video is superior. Video allows you to control the timing and framing in a way that a slide deck cannot. The main downside to videos is that they are harder to make. But there is a reason people prefer science documentaries over recorded lectures or lecture slides.