Both of those are excellent binoculars and either would be a superb choice. The fov is about the only thing there to pick a nit with. The other difference is ergonomic. The Maven has a softer silicone rubber armor, while the GPO has more exposed finish (kind of like rifle bluing) and lesser amounts of rubber armor on the inside of the barrels.Do you think the Mavens advantage is only in the FOV?