As someone said earlier, Reach had only 2 precision weapons. They worked well at the same ranges, but I think needle rifle had slightly slower RoF and possibly slightly weaker shots, compensated for by the supercombine effect.
The needle rifle fired faster than the DMR, but the super combine wasn't an advantage because the DMR killed in 3 body shots as well. Additionally, the needle rifle does almost no health damage to the body, so it was a poor teamshotting weapon unless your teammate also had a needle rifle for the super combine.
Perfection. Where everyone fails. If you expect nothing you can be happy for everything.