Looking at the two videos posted, I think the B-17 definitely looks to be stronger. IMO
A couple more photo's.From the USAF.
A crewless B-17 Flying Fortress "Drone" aircraft of the US Air Force 1361st Photographic Squadron starts its record-breaking 2,600-mile flight from Hilo Naval Air Station, Hawaii, to Muroc Army Air Field, California, August 6, 1946. The drone, one of two which successfully completed "Operation Remote", setting an endurance record for remote controlled aircraft, is shown as it rises into the air shortly after take-off. The flight, which was under the direction of Brig. Gen. William L. Richardson, Chief of Army Air Forces, Guided Missile Division, lasted 14 hours and 55 minutes before the first plane touched down at Muroc. Both drones were veterans of the Bikini atom-bomb tests in which they were flown by remote-control into the radioactive bomb clouds.

