In all probability you'll need to run to both if you want 5.1 and the ability to use the TV's speakers. Most TVs will not pass through 5.1 sound received from other components, but only output 5.1 they receive on their internal tuner. You don't say explicitly what TV you have, but given it's a Sony RPTV, it would surprise me if it will pass through 5.1 as I have a Sony SXRD and it definitely will not. It will pass through stereo, but not 5.1.
If it were me, I'd likely consider just always using the 5.1 system for sound, but obviously YMMV. Unfortunately if you want 5.1 and the TV speakers to both be options you're going to double your wiring essentially...
If it were me, I'd likely consider just always using the 5.1 system for sound, but obviously YMMV. Unfortunately if you want 5.1 and the TV speakers to both be options you're going to double your wiring essentially...