Wasp vs Dragonroach

Ive seen people use the wasp against it, and they seem to take it out in 2-3 barrage, which are much quicker than the spear imo as the missiles are more nimble. Has anyone used it against the dragonroach in its secondary fire mode? I wonder if that would be more or less effective. If the wings were fatal Id imagine more, but until then I'd like to hear about experiences. Ill try it myself when I'm out of work.