Both wheels are great. My chin has a Chin Spin and she loves it. It has to be her favorite thing in the world. With mine, I do have a tighten the bolt on the back of the wheel periodically, as over time it'll start to get loose and shake/make lots of noise.
If for some reason your chin doesn't use/can't figure out how to use the Flying Saucer, I'm sure you can easily sell it through the Classifieds on the forum.