Atrac or rear locker?

[islandryder]

Hey, I am buying a new tacoma trd double cab in a month in B.C. Canada.I noticed on the toyota.ca website that in the options for the trd double cab it has atrac and the access cab trd has the rear locker.I am kinda pissed because you'd think the rear locker would be better for off road and you cant even choose to have one or the other.I noticed that the fj cruiser has both atrac and a rear locker on it and am wondering why the tacoma only has one or the other depending if you buy the double cab or the access cab (at least in Canada).So which one is better, atrac or a rear locker?
Thanx

[tacomaoffroad]

without a doubt the locker. added insurance. i use it almost all the time i go wheeling.