Video, GIF or Screenshots for Beta Landing Page?

If a text are just words, an image is 1000 words, GIF is "x" times an image so a video is small book that tells your story. Funny thing to the side, for a new product the video will be the most engaging element for a new users. If you look at the trend every social platform is migrating from text to images to video. So the new users that will use your product are the new generations that are used to video and they love it. The bad news is that the video is most hard to produce, so if you don't have the resources you can stitch a few images into a GIF animation and as @blakemanzo suggest to convert it to video for better performance. One more thing as Gary Vaynerchuk says every content can be broken into other types of content.