[Mike C]

A limited slip is just that, it allows for some slippage between the axles with the differential engaged. A locker allows no slippage. It is either engaged or not engaged. The automatic lockers "unlock" the inside tire when going around a corner and you are not slipping the other tire. If you have tire slippageon the outside, they stay locked. This locking and unlocking side to side is what clunks and bangs. This is a very simple explanation and you should google how it works for a more in depth explanation.

But bottom line, if you run mostly on the asphalt, limited slip is a better choice.