I've actually not had a chance to use any of them very much, but I can tell you that Jamstix is unique in its operation. You can use it just like a basic drum sampler, or a pattern-based drum machine, but what makes it special is its ability to jam along with you in a realistic manner - it can listen to audio or interpret MIDI and choose what and how to play. It's like working with a human drummer. Its "brain" also ensures that whatever it outputs is playable by a human - it knows it has two arms and two legs and plays accordingly.
As for the quality of the sounds, Jamstix seems quite decent, but it's probably not quite on a par with the mega-samplesets like BFD and DFH. However, it can also host a VSTi and use that for its sounds rather than its own, so it's the best of both worlds.
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