Honestly neither one of these snippets are getting me very hype and I'm hoping they are the least exciting thirty seconds of each song.
Dark Horse is the superior snippet. Walking On Air's snippet is abysmal and the idea of a Carly Rae Jepsen reject being on the follow up to Teenage Dream is just

The lack of lyrical variation also annoys me. Gonna be the All That Matters of Prism.
Let me go listen to Roar and wait for September 17th/October 22nd before I label myself as disappointed.