I'm not sure I really understand "Rendering Intents".
My impression is that "28 Balls" with very saturated, synthetic colors might tend to print better with "Perceptual Intent" rather than "Relative Color". My speculation is that "Perceptual" might "spread out" the very saturated colors, so there might be less banding. My further speculation is that "Relative Color" might group more of the very saturated colors into the same color, and might result in more banding.
Or not?