IroquoisPlisken
Brigadier Idiot
Oh...strange that we haven't met any barbs yet...Barbs = Roaming

In that case, I change my vote to escort. If you're moving the settler along, with a warrior one turn at a time, if something's 2 tiles in front of the settler, you won't see it until it's too late.
Although, I don't see why the settler can't skip one turn so it can move along with the warrior.