Out of the choice, I'd agree with the consensus - the incisor is such a god-awful weapon that whatever your sniping style is, the Raptor will be better at it.
I would say, however, that the Raptor really depends on what you've taken for your assault rifle choice... I'd argue its not worth bothering with if you're sporting a Saber or Mattock. If you have it, the Indra does everything the Raptor does, but better.
I would suggest that you look at this chart
for further info, its been passed around the forums for a while.A warning, however....
some of the stuff in that chart is absolute nonsense. The Incisor apparently sports some of the best Sniper Rifle DPS in the game according to that chart, so really, make of it what you will.
Edited by JaegerBane, 24 April 2012 - 07:50 PM.