It is not possible to say that one is better than the other between open back and closed back banjos. Instead, it is all about the difference in the style of sound that they produce. However, if you are interested in a specific kind of musical genre and want an instrument that suits that genre, then it is possible to say which kind of banjo will be best for you. The function of a closed-back instrument with a resonator is to reflect the sound many times so as to make it louder and fuller that is suitable for modern music. Open back design produces sharper sounds that are not as loud. If you are looking for a more modern instrument than the closed-back style will suit you the best, otherwise, go for an open back one.