We were in both areas last September. As for hiking I would go to Bryce and Zion. Angels Landing in Zion is truly remarkable if you are not afraid of heights. YouTube it before you go. The Narrows hike is unique as well as your trail is water. Also Bryce at dawn/dusk is truly incredible if you are into low light photography.
As for Moab...I really like Moab!! I like driving quads, sidexsides and 4x4's and is a true destination for that type of person. Also the mountain biking is absolutely epic. There is hiking here for sure in Canyonlands and Arches but Zion and Bryce is better for variety of hikes and what you will see.