IMO both are "best" depending on the task.

For getting an anxious or overstimulated driver from A to B, orienting relative to the direction of travel helps them not-mess-up by misunderstanding their direction of travel or missing their turn. It removes some information they aren't prepared to process anyway.

When the driver has more familiarity and will recognize when an important intersection is coming up, then locking North helps them contextualize the area relative to other major landmarks like highways, lakes, etc.