Epi is by far a better "job" prospect concentration. Thats not to say there arent many community health jobs, but with the recent bioterror scares, the demand for competent epidemiologists has skyrocketed. Most Epi students also do a significant amount of biostats coursework, and knowledge of both will land you a good job for sure. In fact, if you're very well trained in epi/biostats, you could find great jobs in the pharm industry doing data crunching for clinical trials or even for random corporations that use SAS to analyze internal data.