It usually comes down to a need for luggage. The FJR has lots, with the side bags, each of which is 3x the size of the same on the B, a Mama Yama rear case, and a Corbin Smuggler, because the wife don't ride. I was taking the B for the trip this week, because I have plenty of other reasons to be verbally abused, so didn't need to bring an FJR to a B rally...