FlightPathOBN:
RNP AR has RF legs, RNP APCH has TF/TF with turns, RNAV straight legs with turns.
RNP AR approaches may, or may not, have RF legs. There are many RNP AR IAPs in the U.S. with TF/TF legs and turns. RF legs are an optional application where they present the optimal solution.
The U.S. does not yet have RNAV APCH, but all of our "plain vanilla" RNAV IAPs have TF/TF legs, more often than not with turns.