In the display world, Apple, Dell, and Samsung pretty much get top pick of all display panels being created for 27" IPS screens; so other brands have to settle

In the display world, Apple, Dell, and Samsung pretty much get top pick of all display panels being created for 27" IPS screens; so other brands have to settle for panels that aren't rated at A+ (which means no dead pixels, no ghosting, no light bleed, etc). Most A- and A panels might have a small (nearly indistinguishable) amount of bleed or one dead pixel. The reputable resellers or new brands offering these screens typically offer a 'Pixel Perfect' guarantee at a small up-charge ($20-ish) to guarantee the screen was inspected and had no dead pixels in the warehouse before shipping to you. I'm not an expert by any means, but I did substantial research before purchasing.