Some How To style things can be easier shown with a screen capture video which would be better then just content.
Several issues with video.. often times the player itself is or can be slow. Quality can be low. The video maker often rambles and what should take 1 minute goes into 3 or 4 minutes.
For the content provider, video is a pain in the ass. Takes time to shoot it, often edit it and then the slow process of uploading and often embedding.
A nice mix of Content and Images is what I like. Mainly screen shots for the images and not just some random image either.