For years, Mode 8 on the PS-3 (dual voiced detune) was my go to modulation sound. Then Iron Ether released the Polytope- a QUAD voiced detune pedal. Watch the videos on Youtube, and read the reviews on Talkbass, it is amazing on all accounts. The PS-3 did not have too many tonal options, it just is what it is. But the Polytope, to my ears, is the be all end all detune pedal. It will shift the pitch so far out of tune it isn't even all that musical. But when dialed in...NOTHING like it.
I encourage you to look hard and research as much as you can...but for me and many others...the Polytope is it.