It’s not about which one’s harder and what everyone else prefers. It’s about YOU. You will be taking this class. Do you personally enjoy Spanish, or music? You see, I might enjoy Music more because I can play the piano. But someone else might not, and consequently they simply may not enjoy Music as much because they have no association with it.
What do you want to study later in life? Do you perhaps want to study in Spain? Or do you already play an instrument? Tell us that and we can work with that information.