You're certainly looking at good lights. I would go with the 2 160s. I was in the same boat with Radion selection and ends up going with two of the XR15s over one XR30. The price was the same and I like having a bit more flexibility. Plus, if one of them goes down, I still have a lit tank while I figure out what my next step is. I'm an not a Kessil guy so it's possible there is some additional difference between the two but if it's a simple question of 2 vs 1, I personally went with 2.