الجمع بين الصحيحين - للإمام عبد الحق الإشبيلي

Here is "Al-Jam' Bayna As-Saheehayn" by Imam 'abd Al-Haqq Al-Ishbily رحمه الله, which is the best book that brought together the Sahihs Al-Boukhâri and Sahih Muslim in one book.

It is here in a very beautiful edition in 5 volumes, the hadiths are with all Harakât, the presentation of the book has been enormously worked in order to facilitate reading or memorization, such as the fact that the differences of words (or sentences) between the version of the hadith of Al-Bukhâri رحمه الله and that Of Muslim رحمه الله were written in different colors,  in red for what was reported only by Al-Boukhâri, and in green for Muslim.