Vasquez-Marquez is the greatest world title trilogy
Gatti-Ward was the greatest non-title trilogy
To say one of these trilogies was greater then the other would be hard for me to do.

Vasquez-Marquez tops Graziano-Zale by a little for me because they had 25 rounds of brutal exchanges compared to 15 vicious rounds between Graziano and Zale. Still, only slightly better for me though both trilogies were incredible.