I agree that, at least to me, the 950 sounds better than previous PSRs. Not talking Tyros 4 here though, because I have limited time on one of those.
I'm not going to carry two arrangers around, as any of the modern middle or top arrangers can do the job very well.
If I were younger, or had a roadie, now that's a different story!
I would have an Audya and a Tyros 4 with me at all times. Sometimes I might even USE the Tyros 4.
DonM