Is there any advise for which one is better? LS or LOCKING Diff.

Can anyone explain the differense?

 

both?
my bro put this in his truck
http://www.auburngear.com/oemdifferentials/ected/

i must say after the clutch's wore in i was very impressed.

LS with friction clutch's would probably be the best well rounded setup. smooth enough on snow and ice, and still useable when out playing.

locking would only be used for play time i assume so it would deliver all kinds of traction for play time.

i dont advise the mechanical limited slip though, i have one and it scares me on snow and ice.

 

Read this, and the links in it.