I know something about this and there is some serious misinformation in this thread. Tuition at SBTS is not 34K or 55K per year. It's 34k (for SBC students) or 55k (for non-SBC students) for the entire program, paid over four years. The vast majority of students will pay the SBTS rate (if they aren't already members of an SBC church, they can join one). So it turns out to be a bit more than $8,000 per year. Tuition at SBC seminaries is heavily subsidized by the SBC's Cooperative program. It's pretty much the lowest you'll find at any seminary, but there isn't a big discount rate.
OP, the PhD programs at SBTS and SWBTS are really designed to create pastor-scholars. If that's what you want to do, it's a good option. It's flexible in terms of scheduling and affordable enough that a lot of people can pay as they go. You should think of it as an expanded, more rigorous ThM with a research bent. But if you want to go into academia, you should not do a PhD at an SBC school (or probably most other evangelical schools). It won't just be a hinderance for job hunting. It will positively disqualify you for virtually all jobs at secular universities and mainline/liberal seminaries. It won't be very competitive at evangelical colleges or seminaries either where you would be competing with people with PhDs from major universities in the US and UK, as well as Wheaton, Trinity, etc. There is a large number of people with PhDs from SBTS or SWBTS who end up teaching at Baptist colleges or SBC seminaries, but they represent only a small percentage of the total graduates. As for publishing, there is no reason in principle that you can't publish with a PhD from an SBC seminary, but the training you'll get will prepare you more to serve the church and the evangelical academy.
Based on what you have suggested about your interests, I think you should probably turn down both offers.