I threw the Mamba and the Grip during a demo day.  For me, the Mamba was earlier than the Grip.  In fact, for me it rolled out on the shot we were on.  So I can't comment beyond that.

The Train was a little longer and much more continuous than either.  Out of all the balls there, the Train seemed the best for the shot that was put out.  I think the shot was a simple THS.

Thanks for the replies. Thinking about a Mamba for burning a line in a pattern because the cover seems so strong.