So, some more details about the test:
I did the test first with Roomba, and some minutes after i did the Neato test. (so area was clean, according to Roomba, before the Neato test).
About the collected dust/etc:
And Neato collected after the Roomba:
As you can see, Neato collected far smaller particles/dust too, which was unable to collect by Roomba (due the weaker vacuum guess)
And the usual brush comparision: (Neato was cleaned approx 2 months ago (!), and Roomba was cleaned approx 2 hours ago - it did a bedroom cleaning too, before this test - Neato's brush is at leftside, Roomba at right)
And the collected mess by brushes, after brush cleaning:
About the cleaning/clean feel: on hard foor they are about same i think, on thick rug Neato is far-far better (you can feel, that the fibers of the carpet are higher due strong vacuum - same feel as using a regular vacuum), and Roomba is better on hard woven rugs, where the fibers are hard and small, and a vacuum can't remove the lints from (not even a regular vacuum), just a brush. I plan to get Vorwerk VR100 brush and try it ASAP, and i try the test using reverse way too: first clean with Neato and use Roomba after to see the collected dust/etc.
And an intresting image about collected derbis in my bedroom (it was not cleaned for some days before test), it was first cleaned by Roomba again, and after Neato. Roomba did cleaning for a little bit more than a hour, and Neato did it less than 8 minutes. That room have hard coverable spaces for Roomba.
Rightside the Roomba collected dust (about 1 hour testrun), and leftside the dust collected by Neato, shortly after Roomba - runtime app. 8 minutes only.
Neato collected about same amount after Roomba, within far less time. In my bedroom i have very thick rug, which is ideal place for Neato.