Mnnnn the Mars that I purchased, came with no optics. It was before they were adding them in.. So I'm sure that had a significant impact.. But on top of that, and I cannot remember the diode breakdown for the via(either the small 300 or the 600 that I have now), but visually they even look very different in the color..
My buddy has the Mars now, and I still see it frequently in action.. And it is a good unit.. Not going to lie.. It very well could be the optics, it could be the diode selection, and it could be a mix.. But I know the Via(as good as the Mars is) simply stomps it with anything I put under either unit.. And the little one(300) is a beast!