On the surface, Econ, in general, would have more positions open every year than finance, which is an endogeneous matter to me. It seems like finance is relatively hard to get in based on the low #offer/#applicant ratio, which is endogeneously induced cause you are comparing one field (the controversially 2nd hottest one now) in B school to 4-5 fields in econ. Good econ department is very competitive. Both econ and finance are parts of social science, in contrast to natural science. Specifically, finance itself is part of Econ. You might find that econ departments include people who work on labor, macro, financial economics and so forth. Finance department would more concentrate on financial economics. These are just my ideas and I would also like to remind you that five years of one's life (at least) might deserve a bit more careful consideration than making a decision of going eat in Wendy's or Burger King or eat at all.