My recommendation would depend upon your purpose for working as a PCT. If it is to increase your knowledge base, go with TIRR. But if you want this job to lead to employment post graduation, the best choice would be San Jac. They are much more likely to have new grad jobs available when you are ready for one.
As a long-time Houstonian, I would also like to clarify the myth that surrounds employment in a TMC facility. These are certainly world-class environments, and nurses working in them have opportunities for exposure to a lot of the newest ideas and cutting-edge technology. However, as a workplace-based nurse educator, I have found that nurses coming out of TMC facilities are actually less skilled because these hospitals are primarily Medical (not nursing) teaching facilities. So, medical students, (interns, residents, fellows, etc) perform most of the tasks that RNs do in non-teaching hospitals. This is true for all clinical settings. The end result is that nurses in community hospitals are usually much more proficient at everything from IV insertion to extubation and managing chest tubes -- certainly more experienced and comfortable with leading a code.