VX and Grande won't have an LSD as they have traction control which needs to isolate each wheel to prevent slip, so therefore only have the high spec DAT, GXL and lower budget have LSD and no traction control, still with DAT but with less features. Brake assist and other bit's 'n' bobs.
So if you were sitting in the up spec models then that 'X' may have been for traction control...
I myself have a GXL with the V6 petrol, i like it as it does everything I need it to and I can fit all 4 kids in it.
A friend has the older diesel model, it struggles to pull his boat, but it is a big boat where as mine does it a lot easier.

Depends on how much you need from the car.