I personally prefer VideoPad, is true both programs are really easy to use, but for editing video, VideoPad provides you the option to load multiple tracks, so you can load many files like videos audio, or images, and have the option to load all in different tracks.
PhotoStage is a Slideshow, yes you load the images and audios too, but you need to edit them all on the same track. Also, you don't get control of the timeframe like on VideoPad.
You can get tutorials for both and the technical support would help you if you have issues with your project.