It's hard to say. The 6 RCA multichannel inputs will allow the Oppo to do the digital-to-analog convervion and pass it to the 970. The digital connection would allow tha 970 to do the conversion.
Either one will probably give you very acceptible results, but most folks would use the digital connection because :
1. It gives you more processing options
2. It keeps the signal in the digital domain longer. This is generally accepted as being a good thing.
The 6 RCA connections will be necessary , however , if you wish to play SACDs or DVD-As.
I use both, generally using the digital connection for DVDs and analog for music.
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HT:
990/770
Oppo BD83SE
Pioneer Elite DV-47A
Magnavox HDMR513h DVR/DVD-R
Sony DVD megachangers-2
Sony CD megachangers-2
Monster power centers-2
Sony 48" rear projection SDTV
Roku video player
JVC AL-A158 Turntable
Polk RT-2000s,CS-650,XS-650s,RT80s
LFM-1EX
Hsu VTF-1
12" Velodyne
Family room:
OPPO 970
Sony 32" direct view HDTV
Denon 3801
Rolk RMs