I'm partial to diesels but still...
New VW Jetta Diesel Tops Prius in Fuel-Economy Marathon Test
The Prius is still the best in the city though. I've never driven a prius, or any other hybrid for that matter, but I'm pretty sure a TDI is more fun to drive. Heck, a TDI is more fun to drive than any other gasser daily driver I've ever driven. The Camry and the TDI should have the same consumption in the city, but the TDI will definitely dominate on the highway.
my 2¢