We get this question a lot, so we've dedicated an entire page to the differences and even created a video explaining the difference. Click here to see our detailed breakdown between the two.
Here's the main difference:
The Creative Lettering Journal (the white book) teaches faux calligraphy. You'll create your basic letter shape and then go back and broaden the downstrokes to get that modern calligraphy look. It's the best place for absolute beginners to get started.
The Guide to Mindful Lettering (the green book) teaches brush pen calligraphy. You'll learn everything you need to know to use a brush pen to create thin upstrokes and thick downstrokes. The book is geared towards beginners.
If you want to learn more about the different methods taught in each book click here.