Depends on your play-style more than anything, m-200 is the new best for rushing the arctic is for the l9 fan boys who mastered it, l115a3 takes forever to get used to, I'm also going to throw in the idea of wait for nexon to release the DSR-1 Subsonic later this month wait for a review on it or buy it. I love the dsr series but you may not have gotten to use one.
My sniper stats to give you an idea of how they handle:
5,477 532 26,862 2.0% 26.8%
Dragunov SVD 464 63 5,062 1.2% 21.5%
L115A3 6 0 11 0.0% 54.5%
L96A1 1,450 96 6,296 1.5% 26.5%
L96A1 Arctic Wolf 2,013 119 7,087 1.7% 31.6%
L96A1 Black-Magnum 231 17 925 1.8% 28.0%
M107CQ SE Ghillie 373 37 1,438 2.6% 27.9%
M-200 518 35 1,596 2.2% 36.1%
M24 233 120 1,338 9.0% 33.7%
M24A3 Woodland 3 2 45 4.4% 17.8%
MSG-90 6 0 52 0.0% 26.9%
PSG-1 29 3 522 0.6% 14.0%
PSG-1 CAMO 1 0 36 0.0% 5.6%
PSG-1 MOD CAMO 18 3 282 1.1% 15.6%
SPR 27 13 173 7.5% 27.7%
SR25 105 24 1,999 1.2% 15.4%