My squadsight sniper ranked up faster than anyone else. I'm not sure of what his kills are vs the rest of the team, but he's a beast. Now, with double tap, the rest of my guys are just there for looks (and interior missions).
I AM building a snap shot sniper for interior levels, though my squadsight really hasn't been struggling too much.
GT/PSN: Silt44 My Blog (Comics, Video Games, and Movies): www.arbitrarynerd.blogspot.com
Assuming Snap Shot lets you use your various special shots with the rifle after moving, that would be its main strength. Otherwise Squad Sight snipers in Skeleton Armor can have fun shooting everything for your team.
"I'd rather betray the world than let the world betray me." -Cao Cao