I cant believe the Ursa is winning. Its a giant hunk of junk that lacks any decent speed. True, it has turrets, and a large bomb compliment, but it lacks the maneuverability to defend itself, and presents a very large target profile.
For heavy bombing, the sekhmet. Its fast, maneuverable, has 4 primary gun banks, and a large missile capacity.
Remember fellow bombers, always engage your afterburners when firing off bombs. They will move faster that way !