I updated both my 5 and my 6 from 8.4 to 9.
The Touch 5 seems *more* responsive and less stuttery. It doesn't have the swipe right to search, which I don't like anyway.
The touch 6 seems slightly *less* responsive and more stuttery. It does seem to have better battery life, however I suspect it has the same battery life but they fixed the battery icon which I think went down too quickly not reflecting actual battery drain.
Does anyone know how to get rid of the stupid swipe right to search screen? Is there a way to turn it off? I hate it.