Howdy from Houston! I hope this will be helpful, this is just my experience which may not be entirely objective...
I recently finished my OBGYN rotation at UT LBJ...mixed reviews from my group, a handful of really cool, fun to work with residents but the majority were intense residents that made the rotation so stressful. OB is already tough, but the residents aren't supportive and step on the weaker, nicer ones. The OB training is strong, plenty of deliveries on call, good board checkouts. Attendings are hands off, only a few will teach the students either at board checkout or conferences, but even the junior level residents don't see them very much. LBJ is also a county hospital not in the medical center.
My roommate's rotation was at St. Joseph's, which I heard was wonderful...more resident comaderie, nicer lounges and call rooms for resting and studying, and Dr. Toy's teaching which almost guarantees a high Shelf exam score. I even use notes from his lectures! The intern runs the L&D board there, which is not too busy.
The other UT program Hermann is cushier than LBJ, the attendings are more hands on and approachable, but you practice what each attending wants. Hours are less, and my friends who did their rotation at Hermann slept more during calls (at LBJ it was frowned upon for interns or students to rest/sleep on call). Hermann is also located in the medical center, right next to UT and Baylor.
UT students don't rotate at Baylor so I don't know about them.