To be honest I was leaning more to the LG and can live without proper HDR for a few years longer while the tech improves.
But that resolution though..I play at 2560x1440 and get around 80-100 fps on ultra in most games.
3840X1600 most likely 50 - 70 fps ? gulp :O
Why would you care about 50 - 70fps when Gsync will work all the way down to 30fps for the LG monitor? 30fps will feel as smooth as 60 with GSync, unless ur playing competitive games that is.