I realized that I have a few fuzzes/synth pedals which can be used for this wobble with my Xenograph. So I want to know your opinion guys, which one sounds better.
I used following pedals:
Subdecay Noisebox
Robot Factory Pulse Synth (without LFO)
Copilot FX Orbit (just fuzz, no ring modulation)
Dwarfcraft Shiva
Zvex Wooly Mammoth (clone)
You can guess which clip corresponds to each of pedals

I also used Iron Ether Xenograph with expression pedal and MXR BOD, which was used in second part of each sound clip.
So here it is
http://soundcloud.com/saintshish/sets/wobble-shootout/