evasmom, it IS confusing but the two MT summer programs at NYU are the CAP21 Tisch program and the Steinhardt program. The one that theatreguy just described is NOT an NYU program, it is offered directly through CAP21 itself and has nothing to do with Tisch. The biggest difference, in my opinion, is that with the Tisch CAP21 program the student gets college credit, and they don't through CAP21's own program. The differences would be similar to the differences between the NYU students who are in Tisch's CAP21 classes and those individuals who choose to take classes at the CAP21 studio conservatory program without benefit of NYU. CAP21, like all of Tisch's acting studios, are professional studios which run a different stream of classes for Tisch students than for those who are taking random classes at the studio. NYU has a contract with the various studios to provide studio training to Tisch's students. All studio classes are taken at the individual studios. All other classes are taken at NYU, so although theatreguy says that all your Tisch CAP21 students' college classes would be taken at the CAP21 studio, that's not true.
Both are good programs but there are differences, most of which are personal choice but the fact that the Tisch program gives students college credit is going to be a big advantage in many student's minds.