There's a lot of overlap in camera apps, so interface and novel features are generally what determine the best. (I like Snapture.) But Camera Plus Pro, already a great alternative camera app, now records video, which it competitors generally don't.
Trump card, folks! (Until everyone else does it too.)
From the App Developers: Camera Plus Pro is the First Ever All-in-One Camera App on the App Store! It lets you record videos as well take photos and share them instantly.