When should I publish in interdisciplinary versus subject-specific scientific journals?
My opinion on this is as follows. If your research advances the state of the art of field X, either by adding new knowledge specifically to X or improving existing methods/knowledge in X, you should submit to an X-specific journal. If your paper improves knowledge in field Y using methods from field X, I would either publish in a journal specific to Y, or in an Y,X interdisciplinary journal.