The Taschenbuch Series is a new collection in softcover and contains 37 individual books. The first ten of thirty-seven books of the Taschenbuch Series have been designed and published; they have matte art paper covers and are pocket-sized and travel-light. It is being published by Oceans Within (The Futuhat Foundation)
Pir Press has also published the first four of 19 Volumes that are hardback; Each volume has two books (e.g. Volume 1 contains books 1 and 2). The Volumes are printed in the highest print quality, with gold-embossed covers, and a generous layout. Volumes have the full apparatus of a scholarly edition. The collection would be a fine addition to your library.
The text of the two formats is the same, but the design, layout, size, font size, and inclusion of apparatus differ.