I usually do NOT like to participate in these type of discussions, but given my familiarity with these programs, I will share this perspective. My onsite sources (derived from all 3 sites) lead me to believe that UTSW probably can provide a stronger overall academic experience than the Baylor-Dallas program.
On the other hand, Baylor-HOUSTON (not Dallas) can probably provide a stronger overall academic experience than the UTSW program. Having said this, Baylor-Houston (an "elite" program), like many programs, would like to improve its pain/musculoskeletal educational exposures for its trainees. This relative weakness, coupled with new faculty at UTSW in pain may prompt a MS/pain oriented trainee to consider UTSW more seriously. However, the overall strength of the didactic programs and neurorehabilitation experiences (at TIRR), EMG/EDX (and the corresponding faculty), existing fellowship programs (in SCI and BI), plus the "reputation" factor (and research too) prompt me to give the overall nod to Baylor-Houston when compared with UTSW.
Caveat: It is the RESIDENT's responsibility to take advantage of educational opportunities that exist in a residency training program. The program itself is a "multiplier" of the effort you put into your education. A hard-working self-starter can become a good physiatrist from most residency programs in this country, even those with minimal didactic programs. Conversely, if you don't work hard, read whenever you can, apply yourself in ALL of your rotations, all of the potential advantages that a particular residency program can offer are squandered.