Apple's display is probably better. The big difference is contrast ratio. Labels lie about it. Dell is ok but not great so don't spend a boat load - pay only what a 28" is worth. A 1,000,000:1 on and LED is nowhere near the quality of contrast ratio on a poor quality CRT. This means your pictures may appear "washed out", of lower color quality and THE WORST: if you walk around your (room) the quality drops to the floor. the quality of LED only works at very small angles (if your in front of it and at the right sitting hight. on some you can't even cross your legs without being penalized by strange viewing differences)
I had a 27" Apple display and with all it's greatness it still wasn't as good as an old CRT i'm using right at this moment for viewing pictures or gaming with mac mini. I got a supposedly "great" LED gaming display: returned it next day - it was far worse than Apples.
There are new technologies emerging that solve that "LED horrible contrast ratio" issue, so don't open your wallet for old technology today. View what you buy in a dark area walking around the room. If the screen saver doesn't remain beautiful as you walk around: don't pay "extra" - buy it if it's "on sale" 🙂 return it if you see issues!
Another BIG problem is most all LED (high res) are 60hz. Even old CRT were twice that. It looks "flashy" comparably, and for gaming: it's terrible un-smooth.
Point is: high res is only one feature of a few critical features that make for viewing pleasure. Don't put all your eggs (money) in one basket and get 1 out of 3.
