Definitely the Sony.

The LG has more forward and pronounced mids, while the Sony has a slightly better kick in the bass. Both aren't really that good in sound quality to be honest, but if these 2 are your choices, then the Sony is a no brainer because of its functionality it provides.

Yes it is a great sounding bar. Too bad it only has ONE input.

The other problem? Because it uses and optical input, that means it is stuck with Dolby Digital and DTS tracks from the TV. However, we are nearly in 2016 but yet there are still many TVs that do not send DD over its optical output. Even less TVs support DTS encodes.

Finally, for 3.8k without a sub and limited inputs? Why not just get an entry level AVR + a pair of bookshelf speakers + 2nd hand sub for about the same price that would literally blow the Sonos playbar out of the water?

The price makes zero sense.
For 1k or less? The Sony CT380 is about as good as it gets for price-performance-functionality, there are no soundbars at this price range that has 3 HDMI inputs and supports decoding for all the major formats. Plus, it at least sounds decent.

If audio quality is the most important, the Philips HTL3140b actually sounds better than the CT380 despite its size.
At this price, you'd probably want to look at the Sony CT780 instead. There was a Sony sale before that brought it down to 1.3k+ not too long ago. Year-end is coming up, so they usually do have a sale around then IINM.