I feel it can be kind of annoying when a video file has no sound because I usually think my speakers are not working, or something is wrong with my sound card. Videos without audio can also make the video's owner/maker look kind of lazy since adding background music is not hard to do on a video file, and there are a lot of free non-copyrighted music files which people can use on their videos.
A slideshow, Word Processor file like MS Word File or PDF may also be a better file choice if the video is mainly a slideshow which shows a few pictures or text since the file size is smaller, and users can copy and paste text and pictures more easier.
A slideshow, Word Processor file like MS Word File or PDF may also be a better file choice if the video is mainly a slideshow which shows a few pictures or text since the file size is smaller, and users can copy and paste text and pictures more easier.