LG S90QY vs LG SC9S

The 5.1.3 LG S90QY is better than the 3.1.3 LG SC9S. They're both unique setups from the manufacturer that include an additional up-firing center channel for better vocal reproduction in the mix. However, the S90QY comes with additional side-firing surround channels, meaning that it doesn't have to downmix this content into stereo like the SC9S. The resulting sound is more clear and real with this content.