IMHO, RN's and Medics are both highly trained, but from different standpoints.
Medics are trained to deal with emergency care and treatment. Primarily, "what can we do to keep this person who is at the point of death alive until we get him to the ED?" Typically, short term care, with oftentimes highly important interventions that must be done rapidly and correctly.
RN's are trained from the opposite standpoint. "What do I need to do to make sure this person will continue to improve until s/he can go home?" Longer term care, highly important interventions, which must be done correctly, however, not always interventions that must be done rapidly.
Medics are trained to deal with emergency care and treatment. Primarily, "what can we do to keep this person who is at the point of death alive until we get him to the ED?" Typically, short term care, with oftentimes highly important interventions that must be done rapidly and correctly.
RN's are trained from the opposite standpoint. "What do I need to do to make sure this person will continue to improve until s/he can go home?" Longer term care, highly important interventions, which must be done correctly, however, not always interventions that must be done rapidly.