I hate the Odyssey. I had one and it was a total lemon. The output was incredibly noisy and once I got my Voyager and Ring Mod I could make all of the sounds the Odyssey made and more. All you need to do is switch the Voyager's filter from 4 pole to 2 and turn off the third oscillator. There you go: Arp Odyssey.
If you do decide to go with one be prepared to save extra money for repairs because you're going to need them. I personally will never buy an Arp product ever again. I know this post comes off as incredibly negative, but all the Odyssey ever did for me was cause me heartache, frustration, and an empty wallet. I spent more money on repairs for the piece of sh*t than I spent on the synth itself.
There is a good reason why Arp Instruments went bankrupt.