I have had the Sony UBP-x800 for several months now and I have no complaints. If there is any noise coming from it, I don't hear it. Picture looks amazing. Set-up is a breeze. The home screen is probably my least favorite part since it looks so 'blah', but that is because my BD player was the PS3 (super cool home screen).
The Sony UBP-x800 does not support Dolby Vision. That is the only drawback I can see. I was hoping a firmware update might add it, but no luck so far. The best buy guy supposedly 'worked for Sony' and 'sony definitely would' since 'sony is the pioneer in this technology'. Yeah, sure.
Granted - there are only several DV discs out there, so it would be nice to be able to watch the DV, but you still get the HDR support with the Sony.
I have mine hooked up to an OLED B6. Looks stunning. I do not have a receiver that supports ARC or Atmos, so as described above I have one HDMI going directly to the TV, and one HDMI going to the receiver (just use whatever input is not in use and select that when watching a movie for sound). I have not had any sync issues that I have noticed.
In looking at the thread for the LG player, it seems there have been many who have sent theirs in for repair, especially due to disc noise. I was considering that player as well due to the (supposed) DV firmware update, but ultimately went with Sony due to the build and reviews.
At $150, can't go wrong with this player!