I agree with brick's mileage estimate, based on my own experience.

I feel the Prius is better if fuel efficiency, cost, ease of parking*, or storage space are prime requirements.

The Camry Hybrid is better if range, speed, or comfort are more important. Also the Prius' fixed-height seats are very bad if you're short.

Toyota designed the cars well, in that they do not really compete with each other. They each have their own place.

*The Camry is longer than the Prius with a wider turning radius, so it's more annoying to park.