This stuff is impossible to translate for me. But the important thing is that there are essentially 2 approaches, and the jury is still out on which one is going to turn out to be the better one.
I guess it's such a big topic at this point because Ferrari and Sauber have impressed early, and things haven't gone according to plan at Merc.
Sauber (who have the most flexible solution) never even considered another approach and thought that the wings presented by Merc and Red Bull (at the presentation of those cars) were fake as they look like evolutions of last season's wings.
Basically you have Sauber on one end of the spectrum (Ferrari comes closest), and Merc on the other (Red Bull comes closest).
One important bit to add from the article is the fact that Mercedes' front wing version produces the most downforce, because the outer wing elements are at a steeper angle.
The downside is the turbulent air which it sends to the back, between the wheels and the nose, which they have to get back under control. That's why you see more complex bargeboards and turning vanes in front of the sidepods on the Mercedes, Red Bull and Renault.
Ferrari's and Sauber's front wing on the other hand produces less downforce but generates a cleaner flow towards the back, at least according to either AMuS or the CFD eyes of Andy Green (from Racing Point Force India or whatever they're called these days).
Die Flügel von Mercedes und Red Bull produzieren eindeutig mehr Abtrieb. Die Flaps stehen außen an den Endplatten deutlich steiler im Wind. Der Nachteil dabei: Die schlechte Luft wird zum Teil innerhalb der Vorderräder vorbeigeführt.
Deshalb ist die Anordnung der Leitbleche zwischen Vorderrädern und Seitenkästen beim Mercedes, Red Bull und Renault auch komplizierter als bei den anderen Autos. Hier ist mehr Arbeit nötig, die Strömung in geordnete Bahnen zu lenken.
So that might tie in to the statements that they're generating too much on the front and too little on the back, or too unpredictably. Which might explain the diva behaviour of the car again.
It's all about the compromise and balance. But I'm pretty sure the Merc guys will get this right.