Barry,
I have not heard the Schwarz yet but based on what I heard in a live concert of SSO two years ago (which is pretty close to what Todd has described about the CD), I'd say go for the Schwarz over the Rattle. I once raved about the Rattle but after I heard his live Carnegie concert and compared his M9th with the two other versions - Macal and Schwarz - my conclusion is that although BPO may have excelled the other orchestras in their technical functions, overall both the Macal and Schwarz have better structures, better idiomatic playing and sonics. Of course, the Macal M9th takes the crown of the three, but if you can't afford it get the Schwarz.
Regards,
John,