[Min-soo Cho]

LG updated the 4K model name into 31MU97 and launched it recently in Korea and it will be launched in US Nov.
The main difference is color and aspect ratio.
31MU97 covers DCI-P3 97% or AdobeRGB over 99.5% but 21:9 monitors supports sRGB color space.
For editing, 21:9 aspect ratio & TBT could be good choice. For color grading or post production, 31MU97 would be the choice.
They also have 27MB85Z which is QHD 16:9 montior with AdobeRGB 99% & Thunderbolt2 and I guess they will launch it also US in Nov.
Maybe you can consider Dell 32” UHD but it’s a little bit pricy yet.