Someone already made a good post but I'll kinda echo it.
Maneuverability is two fold. Sometimes a BP is better, sometimes a GN is better.
GN is better turning around in tight areas. Like a previous poster mentioned about turning around in a hay field between rows.
BP.....lets say you have a driveway that is only 12' wide at the approach. Unless you live on a 4-lane wide undivided road, you just ainy gonna make that turn with a GN without getting off the driveway. A BP of same length can because it tracks better.
Not that running off the driveway onto the lawn is a bad thing 90% of the time, but if in business, what about the clients that have fencing, posts, culvert, or a dropoff and you CANNOT allow the trailer to go off the drive.
So it all depends on WHAT kind of maneuverability you are questioning.