When comparing LG 27UD58-B vs LG 34UC99-W, the Slant community recommends LG 34UC99-W for most people. In the question“What are the best monitors?” LG 34UC99-W is ranked 91st while LG 27UD58-B is ranked 166th. The most important reason people chose LG 34UC99-W is:
You can work with multiple windows at once thanks to a large amount of on-screen space the LG 34UC99-W offers. Its massive 34-inch 3440x1440 panel comes with a variety of split-screen presets that can fit multiple tabs.
Specs
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Pros
Pro Doesn't need to be calibrated
You'll not need to spend time calibrating this monitor because its out-of-the-box color accuracy and gamma tracking are high enough. The monitor's average color inaccuracy dE measures at only around 2.12 - too insignifficant to be spotted by a human eye.
Pro High value for money
You'll be hard pressed trying to find a cheaper 27-inch 4K monitor that offers the functionality and the high picture quality of the 27UD58-B. In this price bracket, the most common 4K options are usually armed with the old-fashioned TN panels that don't look as good as an IPS panel of the LG 27UD58-B.
Pro Good for multitasking
You can work with multiple windows at once thanks to a large amount of on-screen space the LG 34UC99-W offers. Its massive 34-inch 3440x1440 panel comes with a variety of split-screen presets that can fit multiple tabs.
Pro Immersive experience
The 34UC99-W creates that experience of immersion because it's large 34-inch widescreen panel is also curved. The display feels like it surrounds you.
Cons
Con Doesn't support HDR
The LG 27UD58-D doesn't have the HDR mode.
Con Bad for competitive gaming
The LG 34UC99-W isn't responsive enough for it to be used in competitive action gaming because of its high input lag and low native refresh rate.