The CX1 is basically a Bad Boy Ultra with different paint and wider tires. It's got nicer parts than the BB9,so if it's in good enough shape it's a better deal. You'll have to decide if it's worth more to you. Also,the biggest issue is which fits you better.
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C'dale BBU('05 and '09)/Super Six/Hooligan8and 3,Kona Dew Deluxe,Novara Buzz/Safari,Surly Big Dummy,Marin Pt Reyes,Giant Defy 1,Schwinn DBX SuperSport,Brompton S6L/S2E-X/M6L-X/S12 T Line