Hi Janlo,
Is that a recommendation against the Adult Piano Course? If so, why? Why do you prefer the red book to the green book?
Okay, pros & cons of
the red book vs. the green, but first a preamble:
Sixteen years ago my teacher started me with the preparatory book
Teaching Little Fingers To Play. It's a good little book of not many pages, a good place to begin, but not absolutely necessary. I then went on to the red books along with a "Thompson-Hanon Book 1" aka
Hanon Studies: Book One of technical exercises, which I also recommend. I moved from NYC and stopped lessons when I was probably a third of the way through Book 2. Fifteen years later I am beginning again and started with the first red book. Then I borrowed the green book from a friend and made a comparison - ending up ordering it to supplement what I have. I would recommend having both of them. Again, I recommend Thompson's method books if you prefer more classical music rather than more popular selections. As you progress in his series the selections become more entirely classical.
The first red book has 50 lesson pieces which include some titles which appeal more to children - but these are not your usual children's songs, I'm really referring to the names he gives the pieces. It also includes three pages of technical drills in the back of the book - a good introduction to Hanon exercises. In the first red book almost all the notes are finger-numbered, which Thompson believes does NOT hamper progress in playing the piano. There are also graphics/drawings throughout the book for each piece (which some people on Amazon confessed to coloring). For someone just learning the piano, the page looks more "user-friendly". There is a cd available for all of the music in the first book. Some editions come with the cd, some don't. The rendering of the music in midi format is positively awful (the piano part can hardly be heard from the accompanying synthesizer noise - think oomph pah pah, bells, etc.) and I'm glad I didn't hear it when I was learning the pieces years ago, but then I had my teacher play them for me -- but still, it is good to hear how a piece, the rhythm, should be.
The green book actually has an introductory section which includes most if not all of the "Teaching Little Fingers To Play" pieces (I'm not absolutely sure as I no longer have that book). Then it continues with what is the fifth lesson piece in the red book. In toto, it has about 14 of the 50 pieces that the red book has, plus about 18 other pieces -- some of them may be identical to some pieces in the red book but with a name change. There is less finger-numbering of the notes in the green book. Technical drills are more spread out through the lessons rather than in an appendix at the end of the book as in the red book. There is no cd available for the music in the green book. There are no pictures in the green book - you are looking at plain, stark, sheet music.
I had read somewhere on the web that someone felt that there was a 'jump' between the first red book and the second and liked the green book for filling in the gap. I never felt that way. The green book has two more pieces after "John Peel" which is the last one in the first red book, but I don't know if that will make such a difference. Again, I like having both books as each has some pieces which the other does not have, and because I like having the same pieces with more, or less, finger-numbering. Once I learn a piece with the numbering, then I can review it without the numbering.
BTW, I also recommend downloading the free program
Smart Score X Demo Piano Edition by Musitek. If you scan a page of music, it will read it and give you a midi playback. It helps so much to hear a piece with which you are not familiar. Of course, if you are taking lessons with a teacher, he/she would play it for you, but for those of us learning on our own, it is a great help to have a program like this. Again, I recommend trying to get music books which do have a cd with them, e.g. the Alfred Masterworks CD Editions.
I hope I've answered your question.
ETA: Here are links to see the first two lesson pages in the red book:
Lesson 1 Lesson 2 Teaching Little Fingers To Play