It's to my understanding... (correct me if I'm wrong, guys)
That the DS and Precedent are almost identical when it comes to the engine and drive train!
The body, frame, front end components and wiring, are completely different!
Now... If you compare an 2008 DS, to a Precedent...
the engines may be different!
(correct me again if needed)
Right around 06 or 07, Precedents came standard with the larger FE350 engine,
Whereas the DS still has/had the FE290
So... yeah... the Precedent would have more power!
(There should be a paper tag on the plastic flywheel cover that will start out FE290 or FE350)
IMO... It really depends what body style you like, and what you want to do with it!
Good luck with your decison!