I own the 1600 and have played with a couple B models. I don't think anyone is going to be happy with either unit if they are buying them for the ballistic features. They both use ballistic curves in place of BC so if your bullet/velocity combo doesn't match the curve you are out of luck. Even if it does match fairly close there is no way to fine tune your ballistic curve at all.
The G7BR2 is really the only option for a ballistic rangefinder. I think there should be some good competition coming down the pipe soon but for now I wouldn't bother with anything else.
Now from a pure range finder point of view the Leica is excellent. It ranges very well past 1600 yards and gives angle, temp, and pressure which essentially eliminates the need to carry a wind meter