What is the difference between the blue and black top DSM injectors?

From 3SI Wiki

Blue top

Nikki INP-009 2.2 ohm 450cc @ 3 bar (43.5 psi)
low impedance (current "peak and hold") top-feed
single-spray pattern disc nozzle
OEM for DSM 1st gen (91-93) turbo

Black top

Nikki INP-018 2.2 ohm 450cc @ 3 bar (43.5 psi)
low impedance (current "peak and hold") top-feed
dual-spray pattern disc nozzle
OEM for DSM 2nd gen (94-99) turbo

Brown top

(stock for comparison)

Nikki INP-014 2.3 ohm 360cc @ 3 bar (43.5 psi)
low impedance (current "peak and hold") top-feed
dual-spray pattern disc nozzle
OEM for Stealth R/T Twin-Turbo and 3000GT VR-4

While both DSM injectors are compatible upgrades for this platform, the spray pattern is different; some believe that the types should not be mixed and that the black top is a better choice since, like the stock injectors, its dual-spray pattern aims fuel at the two intake valves.

Photos (not to scale) and flow information from Jared's Gallery