This is for US and Canada Videos will by far get you the best engagement out of any ad type. I am constantly between 0.01 - 0.10 / engagement for videos. With the relativity always at 10. Log in to your news feed. You will notice that the top of your feed will likely be videos. Mine is literally video after video after video .... from sponsored posts, to stuff that friends liked or commented on. Make videos for your campaigns to get the best engagement. If this helps you, just drop a comment. My last campaign (promoting the same thing)... i had 0.76/engagement on a photo, and 0.01 promoting the same thing, but with a video.