Aginst common wisdom as I tend to steer more into the ambient/dark-ambient/experiemental areas, I have my PitchFactor after most of my modulation pedals and even after one of my reverb units, then followed by chorus, and ending with other delay/looping pedals and rack units.
I actually like the degree of unpredictable, occasionally glitchy oddness having things like reverb before the PF can create. 
