All mentioned speakers are very different, at very different price points.
What's the use? Home theater?
How loud do you want the speaker to be able to be?
How big can it to be?
How expensive can it be?
About the charts, do you see the sound power index? The orange line at the bottom? Do you see how it dips down at 5,5k, and then rapidly rises? That's an indicator of the dispersion getting wider relative to the on axis sound at 5,5k, and then narrower above that. You can see the same thing in the lines up top. The black line, which is the on axis response, is actually not as loud on axis at 5,5k as it is towards the walls, floor and cieling, ie, the early reflections, ie, the blue line.
As far as quality of sound goes, a smooth sound power line seem to be a very good indicator of a good sounding speaker when in room. I believe Harman did the research behind that. As far as the Ascendo speaker goes, it's far from flat. the Genelec is the best when it comes to sound power smoothness, but it's output capability is lacking for loud HT uses. The JTR is as loud as anything, and has a pretty decent sound power response for how damn loud it is. The louder HT communities seem to like JTR a LOT. Which one to pick? It's a tough choice, and it depends on your requirements.