The question remains as to which rendition is more accurate. Although Bidini's performance of the piece is more melodic and expressive, it is difficult to forget that you are listening to a modern concert grand. Cziffra's performance performed the continuous unifying rhythm that was a signature of Scarlatti's work. Cziffra's attach and approach to stops was much more reminiscent of a harpsichord of one of the early pianos that were available to Scarlatti. It would appear that Cziffra's performance is much more accurate from a historical standpoint, although it may not be as pleasing to the modern ear.

Cziffra's conservative approach to interpretation provides a timeless walk into history. Whereas Bidini's approach may be more appealing to the modern ear, it lacks the timelessness of Cziffra's rendition. When one considers the importance of Scarlatti's work as a defining force of baroque music, it is important to preserve the historical context of the piece, in this respect; Cziffra's...

And Courne, J. Domenica Scarlatti. Concise Oxford Dictionary of Music, 4th Edition, Oxford University Press. 1996. http://www.classicalarchives.com/bios/codm/scarlatti.html. Accessed May 18, 2008.
Koster, J. Towards an optimal instrument: Domenico Scarlatti and the new wave of Iberian harpsichord making. Early Music. Vol. 35, Num. 4, November 2007, pp. 575-603.

Wolfe, W. A Masterclass with John Williams at the University of Arizona. October 30, 2002. http://www.guitarramagazine.com/WilliamsMasterClass Accessed May 18, 2008.

Recordings

Cziffra, Scarlatti Sonata K96 in D Major - La Chasse. http://www.youtube.com/watch?v=mdN95IQ83d8 Accessed May 18, 2008.

Fabio Bidini plays Domenica Scarlatti: Sonata K.96. http://www.youtube.com/watch?v=ZBgI5bLNF5Q Accessed May 18, 2008.

Source: http://everynote.com/goods.1/Son418.pdf