Kudos to Dell for the matte screen
While I would prefer to buy an Apple product over a Dell product, I must say that, if the color gamut on both monitors is the same, I will buy the Dell monitor because it has a matte (aka "anti-glare") screen. Apple's display is, by far, the most reflective monitor in computing history due to the glossy glass cover.
However, if the color gamut is the way it is now, i.e., Apple using standard gamut (around 72% NTSC) while Dell is offering wide gamut, I will easily choose Apple. It is horrible to use wide gamut displays for everyday apps (browsers, Office, Quicktime, jpeg viewers, Skype, etc.), because they over-saturate the colors, and all standard gamut emulation modes on wide gamut monitors are awful. I'd rather have a true standard gamut monitor.