Presumably that's because the Apple screen offers ease of use and compatibility, not because it's fun to spend an extra 200 euros 😕🙂
This may be more info than you want to read. I'm not trolling against Apple here, I am a pretty happy Mac user now...
I'm new to Apple. I've had a computer of my own for 35 years or so, and only switched to Apple in January 2013. My experience so far is that you have a better time with Apple if you do things "the Steve Jobs way", and don't try to buck against what you're being gently forced into. I'm running a lovely clicky PC keyboard off the Mac here, but things get interesting when I need to press a non-standard key.
In January I bought a MBP, my first Mac. I sent it back within 10 days. Somehow the graphics (particularly fonts) weren't crisp on my NEC. They also weren't crisp on the built-in non-retina monitor (which is lower res than the NEC).
I replaced it with a Mac Mini, thinking the MBP had a graphics card issue. The Mac Mini also didn't seem crisp on my NEC. I tried thunderbolt, HDMI, DVI, my telly as a monitor, my old monitor from the garage, and so on. All still blurry fonts. THEN I started to run Windows inside of the Mac Mini, and I realised that Mac Mini + Windows was super-sharp on the NEC.
In the end it seems that Apple does things to its fonts which makes them look blurry to me (no one talks about this, but they have a completely different way of rendering fonts). I think Apple try to render fonts for print, whereas Windows renders fonts for screen. The result is that the pixels in fonts on Apple machines sometimes fall on the lines between the pixels on the screen, resulting in a double-fat half-intensity line, aka blurriness to me. My impression now is that the higher resolution monitor you get, the less blurry Apple's horrible fonts will be. For that reason I would choose the Apple monitor. I also would never buy a non-retina MBP again, personally.
I still don't like the way Apple does fonts, but I'm getting used to it. Graphics, such as photos in Lightroom, are pin sharp on the NEC, and that is what matters to me.