There definitely is a huge synergy between these 2. They seem to merge both their skills is such a way that the outcome is always (way) over the average.
For me, Kanno is THE s#1t in terms of anime music composers. Her works are always outstanding, and I'm particularly fond of her work on the Ghost in the Shell:Stand-Alone series, then MF came even to her GitS work. As a side note, I like a lot how Kanno seems to keep her "music team" pretty close, with most of the lyricists and vocalists working for most of her projects: Gabriela Robin, Steve Conte, Scott Matthew and Maaya Sakamoto, which gives her work a sort of consistency. I love her songs sang by Ilaria Graziano.