I go back and forth...
The PNW is great as a master clock, and does a great job of rhythm division work (which is great, in combination with the Bitbox, for rhythmic goo). When I have this in the setup (in combination with the expander, which provides MIDI to the Toolbox), I tend to do rattling bangers that are heavy on the rhythm, and light on the ambience.
When the Zadar is in play, I tend to take advantage of the long timeframes to make much more ambient, fluid work. Also, some of those shapes in the higher banks of Zadar presets can provide real 'human-sounding' LFO action, and I love to draw those in.
I really like having a settled system, but this seems like it will be a forever swap-out situation. Too bad I can't get one of those other modules to be 10HP thinner!