There was just a discussion on this recently. It was determined by comparing both head to head that the Mars was better during the day and at dusk/low light conditions and side visibility. The PBSF excels in pitch darkness. I have a Mars 2.0 and 3.0 for redundancy and higher visibility with two instead of one. Armed with this information if I were starting from scratch I would go with a Mars 3.0 and PBSF combination.