Yes, the B-29's development first started with an official letter, containing Request for Data R-40B and Specification XC-218, arriving on the desk of Phillip G. Johnson, President of the Boeing Corporation........
Yes, I know ALL about the B-29's development, Combat Deployment Preparation, the raids from China, the early raids from the Marianas, through to the Destruction of Japan with the Fire raids and Nukes.......
I see you've mentioned some very choice raids in 1945 running-up to the final dropping of the nukes......
I could mention for example, the first arrival in India, April/May 1944, of 148 B-29's, supplying of bases over the Himalayas [the ' Hump '], into China, where at the best deliver-rate of fuel that was assigned to the B-29's to deliver, ''was 2 gals of fuel to deliver one, at worst that rose to 12 for every one gallon delivered, that just the flight over, negotiating the weather, was counted as a ''combat mission'' with a camel painted on the side.......''
The early raids from China, with finally the first raid on Japan, on 14 June 1944, against the Imperial Iron Steel Works at Yawata, on Kyushu, of the 47 bombers that made it there [ they lost six to accidents and one to enemy fire], only one hit was recorded, and that was 3/4 of a mile from the Aiming point......that was the first B-29 raid on Japan...........
Now you can pick all the choice plums of the B-29's eventual successful raids, or you can thoroughly read it's WHOLE History of Development and Service in WWII, and arrive at a really self-honest appraisal of it's terribly lengthy and serious teething-troubled development, and the lengthy and costly development of it's Combat Career, to eventual successful VLR Bomber...... and THEN compare that to the Model 683 Avro Lancaster.......
The Lancaster was born of a compromise, and derived from a design of a medium bomber, and emerged as THE most successful Heavy Bomber to serve with any of the combatants in WWII......Of the 7,300 built by War's end, they flew more than 150,000 sorties between 1942-45, dropping over 600,000 tons of bombs, loosing 3,345 missing in action, and the only operational aircraft [as we all know,] to drop 22,000 lbs of bomb......
Although the Manchester development started in mid- late 1930's, the decision to start the Lancaster design was initiated on 15 Nov. 1940, it first flew 9th Jan 1941 and was first operational on 3rd March 1942.....
In my mind, the ''Best Bomber'' would have a good strong development and service career, be economical both in crew and fuel, and be able to show it's ability to defend itself and absord some punishment, as well as deliver it's ordinance successfully, over and above any ''choice'' successful missions it may have performed.......
While I agree the B-29 was the biggest bomber of the War, and had it's special features, and although it was NOT designed specifically to carry a Nuke, because in still ironing-out it's bugs in development, some were re-assigned for modification and they got the job.....
At the cessation of War in the ETO, Lancasters were underway to form 'Tiger Force'', to happily continue on after Germany and bomb Japan to rubble too......
If you were to post-up the B-29's FULL history, as I could on the Lancaster, the General Consensus, in all honesty, would show the B-29 wanting on many aspects.....all I'm asking for here is some latitude around our respective patriotism, and what service is, was, and both aircraft played important roles during the War....While the B-29 was of a more futuristic design, of high altitude, armaments and strategic delivery, the Lancaster gave exemplary service from start to finish, was developed under extreme pressure of War and was extremely well built in those circumstances, with a minimum of well-trained crews and delivered hard against an entrenched and formiable enemy who still had Air Superiority.....for awhile...and in ALL weathers.....