Owning both the Tyros and a Motif ES 8, these are really IMO 2 totally different instruments with only the vaguest of similarities in the abstract.

Phrase factory is somewhat of a misleading or at least amisunderstood term. It's meaning is more of a concept rather than a thing. It is about combining elements from the Motif as AJ pointed out, arps, remix and patterns, all recorded to make a phrase. The phrase then gets combined to make patterns that in turn make songs.

As Pro pointed out, it is a very creative tool but takes a whole lot more work (IMO) to do then the more auotmated user friendliness of the Tyros.

All depends on your wants and needs. The Tyros more fun to just sit down and play an entire arrangement, the Mo will take work to play an entire arrangement, though one can certainly sit down and play voices and performances.
Terry

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jam on,
Terry http://imjazzed.homestead.com/Index.html