Don't forget that if you have the north up function on the direction arrow or vehicle will travel across the screen in your true direction (N,S, E,W)
I find the track up function better. That's personal though
After years of using paper maps on the road or in the bush I have come to prefer the 'north up' mode. In cases where you cannot determine your direction of travel from the sun (cloudy, night time, confused, etc) I can see at a glance which way I'm heading. There is no "right way". It is a matter of personal preference.