Mathetes, I think some added emphasis must be put on where and when one completed her/his MDiv and where one wishes to pursue an MTS/MAR or ThM/STM. An MTS or MAR could bear significant overlap to an MDiv degree. At schools where an MTS/MAR is un(der)funded I think it is a waste to repeat classes one would have taken for an MDiv degree. For instance, the MTS degree I completed required 4 credit intro courses in NT and OT, 3 credit courses in Church History I and II, a Christian Education course, a Theological ethics course, and a course in dogma all of which were required for the MDiv degree. Some div. schools may have no overlap in curricula for their MDiv and MTS/MAR degrees, but many do. If someone could enter an MTS from an MDiv with advanced standing, not having to repeat those courses, then I think it could be worth it. If, for whatever reason, that is not possible, then I do not see the advantage of repeating all those introductory courses, especially if the div. school offers only 25-50% tuition. The factors that weigh into one's decision on what program to choose will be different for each student. Another question is: Does one intend to finish the MTS/MAR or ThM/STM? If no, then I think one has to decide what his/her main objective is in starting the degree in the first place (e.g. to pick up a language(s), to do course work in a particular field, to work under/with a specific scholar, to participate in a large consortium of schools (ACTS in Chicago, or GTU in Berkeley, CA), etc.). There are many angles/approaches to this question of what degree is best suited to prepare one for doctoral studies. It really depends on where one is at academically and what one's financial situation is. I would highly recommend that those ready for advanced work do an advanced degree, a ThM/STM. But, if an MTS/MAR is cheaper, more accessible, or generally fits one's objectives better than a ThM/STM, then go for it. Another solution, as someone already suggested, may be to take courses as a non-degree student; that may be cheaper and more fitting for students who do not wish to complete another master degree.