+Mingzhang Yang recently shared a post about Xodo PDF Reader and Editor. After a brief look I came away quite impressed with its annotation features. Xodo's Chrome App is new, but they have PDF annotation apps on both Android and iOS. The ability to use the same annotation app on multiple devices is a great advantage.
One of the features that has been missing for me with Notable PDF is shapes annotation. Since often PDF's are image based few of Notable PDF's annotations would work. As I explored Xodo I focused in on an image laden PDF - a menu - to see how well it handled non OCRed content.