The hanging height may have some baring on your choice.
I can't do a personal comparison as dhl have stuffed the delivery( German efficiency eh?!)
What I have found with the reflector is, there is a point , around 12", where the light can cause issues. This is closer than mars recommend, so it's not a fault. I don't think this will be an issue with non reflectors as I would assume the light blends at a higher level.
Like I said, I'm talking about getting to close to the light, this is not a heat damage issue, it causes localised over transpiration, which in a hydro system means over feeding.
Other differences, all the reflectors are switchable veg to flower, only the big mars 2 is. Just saves a bit on the leccy bill.
Relectors lighter and runs a bit cooler judging by the vents (the led light chip are cool, the drivers mounted in case get hot and are fan cooled).