I would recommend against the marema, based upon a friend's experience and other things I have read about that breed. I will recommend for a great pyrannese, based upon another friend's experience with hers, and for the anatolian shepherds based upon long term posts by someone on another chicken forum.
You can't judge a breed based on one individual
Personally , I wouldn't recommend ANY of the TRUE LGD breeds for "free ranging".
They are notorious for wandering.
They shouldn't be raised as "yard dogs".
Don't confuse "guarding" behavior with "territorial" behavior.
Most any dog will defend it's territory, and since chickens never roam very far, any "yard dog" that doesn't bother the birds will "protect" them
Just don't kid yourself into thinking the dog is truly concerned about the birds.
You can't judge a breed based on one individual
Personally , I wouldn't recommend ANY of the TRUE LGD breeds for "free ranging".
They are notorious for wandering.
They shouldn't be raised as "yard dogs".
Don't confuse "guarding" behavior with "territorial" behavior.
Most any dog will defend it's territory, and since chickens never roam very far, any "yard dog" that doesn't bother the birds will "protect" them
Just don't kid yourself into thinking the dog is truly concerned about the birds.