It's mono, IIRC. There is likely no difference between the analog and digital tracks.
A dirty little secret of some later model LD players is the analog output was lowered a bit to make the digital sound better/louder. My old player (which does much better at ignoring rot and speckles) is analog only, but sounds great with a CX encoded track. Most of the titles I've captured off of it don't have digital tracks anyway. Hope this isn't a problem?