I think Tony's study showed that Accounting and IT were the fields with more DBAs. It makes sense as it is not easy to find qualified faculty for these fields so my guess is that any doctorate would do. For a research intensive University, my guess is that the PhD would be preferred. For a four year university or community college that hardly requires research, I honestly don't think it matters. Same for adjuncts, if you are just teaching a course here and there, a terminal degree is more than enough. If a DBA has a strong research record, I don't think it would matter much the designation either. I rather hire a DBA with an impressive publication record for a research professor position than someone with a PhD with one or two publications on uknown journals or conferences.