Your heading reads "Best low light scope?"
Your text doesn't seem to ask the same question.
Here goes. My best low light scope is a Swarovski z5 5-25X52. But my Bushnell 4200 4-16X40 is so close I have to switch back and forth to see which one is better.
Before I sold it my Nightforce 12-42X56 was way better than either of the above. I mean like 12-15 minutes better. Hopefully someone with a different brand of 56mm scope will chime in.