If you are interested in topics at the intersection of the two disciplines, Accounting is the better choice (resources, placement, and salary). On the other hand, you have to be sure you're happy to teach accounting classes. Back when I was applying to grad school, I was considering applying to Finance PhD programs but I just couldn't stomach the idea of teaching Corporate Finance 201 for 35 years.
Accounting degrees can be idiosyncratic and flexible in content compared to Econ programs. You'd have to research the requirements (and areas of flexibility) of each Accounting program pretty carefully.