How should one decide whether to study logic in a math or philosophy department? In particular, besides the more obvious fact that your courses and qualifying exams are going to be in different fields, are there any subtler reasons to prefer one department over another? Some possible refinements of my question are:


Is there a significant difference in resources available to logicians in one department over another? (Perhaps philosophy departments tend to be more well-funded than mathematics departments, or perhaps there are more fellowship opportunities available to students in math departments.)
Are there any significant differences in academic expectations? For instance, are there perhaps greater expectations to publish more frequently when in one department versus the other, or does perhaps one department take its language requirement more seriously than the other?
Related to the previous question, are there any significant cultural differences between the two departments?
Does choice of department have any impact on postgraduate academic job prospects?
Is it possible at all, once you are in one department as a graduate student, to switch to the other?


I ask these as general questions, though here's some information about my personal circumstances if they make any particular answer more apparent:

I am currently a third-year undergraduate math major interested in graduate study in logic. I have the dubious and unsavory distinction of having a departmental GPA lower than my overall GPA, but outside of a course in ethics and a (spectacular) course in philosophical logic, my philosophy-related coursework has tended to focus more on continental philosophy. In short, it is not clear to me that I do better in one field than another (I have done well in all my philosophy/philosophy-related classes, while I have done either spectacularly well or spectacularly horribly in my math classes), and I deeply enjoy learning about both. I have also heard rumors that philosophy graduate admissions tend to be, by virtue of self-selection and small entering class sizes, much more competitive than math graduate admissions, but given my own record, it's not clear that admissions to one department will be easier than admissions to another (though this has little to do with whether one type of program is better than the other).
I am a math professor, and from what (very) little I know about philosophy, I would expect the academic cultures to be very different. Once (as an undergraduate) I went to a lecture given by a leading contemporary philosopher. During the Q&amp;A period, one audience member remarked: "I think your point of view is obviously wrong... " and proceeded to elaborate at length! I've never seen this in mathematics. Despite what you've seen in movies, I've found academic mathematics to be quite friendly and relatively nonconfrontational.

My understanding is that (perhaps unfortunately) philosophical logic and mathematical logic are considered entirely separate academic disciplines. I went to graduate school at a university with a strong mathematical logic program, and what my friends were doing was recognizably mathematics. I don't think I heard them talk about philosophy, at least any more than it came up during random conversations. I would recommend to you that you learn something about model theory, recursion theory, axiomatic set theory, the incompleteness theorem, etc. and see if this is something you enjoy.

I doubt very much that you could switch from one department to the other, although I don't have any firsthand knowledge of this.

I would certainly expect graduate admissions and the job market to be very different. My understanding is that the job market in mathematical logic is very difficult; indeed, I only know of one of my logician friends that is now in a permanent academic position. (That said, the others found good non-academic jobs.) However, my guess is that the job market in philosophy is still bleaker.