This is what Yamaha say about the the Storia III:
STORIA III delivers warm yet balanced tones and a luminous finish - a refined addition to your environment that is both relaxing and stimulating.
Created for the modern day player and also with beginners in mind, the Storia II has an onboard pickup which makes it simple to amplify. For comfort and ease of use - it has a smaller body and shorter neck; rounded edges on the neck also make it easier to access the frets.
The guitar sounds amazing, either amplified or unplugged - and with a full and balanced rich tone that can sound great with any genre of music.