Witch is a better system for regular driving in upstate NY? We are talking about a lot of snow in the Winter. A lot of mud in the Spring and late Fall. The systems I am looking at are the clutch pack system. and the cone system. I drive sixty miles a day or more mostly highway with some off road tossed in for fun.
The Ford setup is called Trak Lok and GM's version is called positraction.
It really comes down to your preferences and knowing what type of settup your driving.
A open rearend is alot more forgiving on ice, especially if you just stomp on the gas, just the one wheel will spin, and you wont get any fishtailing, where as a track lock will lock both wheels up and will cause the rearend to fishtail.
You can often get started better in winter conditions with a LS rear end in straight lines, but accelerating around icy corners is really dangerous as the rearend will come out and around you.
A LS and 4x4 makes a great combo for the weekend wheeler, as they are very streetable units, and are also very effective on mild to medium trails. For the hard core stuff, lockers are the only way to go.
It really comes down to how well you know how to drive in winter conditions with a LS, for example dont accellerate around corners, and dont mash the pedal to the floor on ice.
Of course this all changes if you want to whip cookies in the Walmart parking lot.