Purely from theoretical (not actual auditioning) triangulation I think I would find the ZXY UNIverse Premium a little bit smoother and a little bit warmer than the Opus.
Ron, you can have David install two SME 3012R arms on your new AS2000 and get both cartridges. Then you will really KNOW which you prefer and how they work with your phono stage and gain. See how easy that was?