The efficiency of each encoding method largely depends upon the complexity of the score. For a simple score, where the same rhythm happens over and over or with a simple rhythm, you may enter notes very fast with a music keyboard. But as the score complexity increases, as the rhythms become more various and complex, the efficiency of the use of a music keyboard decreases. Inversely, if the score becomes too complex, you will even lost time using the music keyboard because you will need to make lots of corrections after the real time recording.