Urban Teachers gives their teachers more training than Teach for America, as I understand. For TFA, teachers do a six week summer institute and start as full teachers in the classroom the following fall. They receive some coaching and follow up from the organization. The goal of TFA isn't for their teachers to stay in the classroom, but rather to do a two year stint in teaching and move on.
Urban Teachers has their students start with a summer program, then they are teaching assistants for a whole year with a mentor teacher in a classroom and take classes in educational pedagogy and instruction at night (they earn a Masters in education over the course of two years). The goal is for their teachers to remain classroom teachers.
I think UT does a much better job than TFA but of course it's always possible to get a bad teacher!
Source: DD was considering alternate route teaching programs and she looked into both these options, as well as some others, but decided not to pursue any of them.