tormodg wrote:I have used Noad's book since forever (around 1990), they are great - I still play several pieces from the books.
Duncan's method is excellent, but more philosophical. I enjoyed it a lot when I was a student 25 years ago - it took me down a different, deeper path to understanding how to play and enjoy classical guitar.
I think Duncan's books are best enjoyed when you reach a higher level and have more experience.
You're probably thinking of Duncan's older "Art of Classical Guitar", which is indeed more analytical and philosophical, and which I recommended above as a supplement to a method for those adults interested in going deeper into the theory behind the technique. It was a popular college level textbook, according to Duncan.
But the OP is asking about the more recent "A Modern Approach", which is a method book for the complete beginner to get up and playing quickly. And suitable, I think, for kids as well as adults.
Let me also note that Duncan's "A Modern Approach" is available in a single compilation volume, which is, like the Sagreras books, available in spiral or comb binding. For me the binding would be one point in favor for these books--maybe a minor point, considering many books can be rebound, but it might help break a tie.