For a start, the formation of RAF 617 Sqn., and also with the specialist 'pathfinder' RAF Sqn.'s, was selected from the cream of Bomber Command aircrew, on a volunteer basis.....
And although RAF BC had the Mk.XIV Bombsight, that was entirely adequate when used in conjunction with the various navigational bomb-aiming radar that the RAF developed and used....being an established fact that they were THE leading exponents of this....why, they even bent the German's 'Knicklebein' bombing-radar for them.....
In the ETO, it wasn't really fair, the 8th really only had the Norden.....the RAF BC had the primo equipment and tactics, suited to their designated night-time bombing technique, working hand in glove with Mosquito Pathfinder and Master-bombers, able to put hundreds of bombers over a pin-pointed factory or such in like 15-20 minutes....along with Mosquito Nightfighters floatin' around....
With ' Oboe, Gee, Gee-H, H2S etc., ' along with all the accessory ones like 'Monica, Perfectos and Serrate,' etc., they worked their style into a truly massive and cohesive bombing campaign....
And a great deal of that technology assisted the B-29 campaign in Japan..
The point I'm trying to make is as 'Best Bomber', the assumption that because the B-29 was futuristic, faster, of greater capacities etc. and BIGGEST bomber of the War, and dropping the nukes certainly embellished that, it's effective War-time service spanned from June 1944 to August 1945....period.
The Lancaster flew from March 1942 through to April 1945...it broke in all the night-flying tactics and associated equipment....it effectively proved to be the Most successful Heavy Bomber in the ETO.....
The B-17 B-24 if adopted for the night-bombing in the ETO would've been very successful using the RAF tactics and equipment, although not quite the same bomb-tare...and with at least 4 less guns.....
But their daylight missions in Europe DID greatly contribute to B-29 development....it being so plagued with problems, and taking so long to get sorted-out............
'' In addition, as work on the B-29 prototypes progressed, the AAC insisted upon a phenomenal number of design changes, totalling nearly 900 between mid-1940 and late '42, in light of lessons emerging from the war in Europe''...
....which especially entailed the development of the Sperry/General Electric turrets and fire-control systems.....
When they finally sorted-out the Wright R-3350 engines, the props and all the aircraft's other problems, starting crew training in late '43, using returning B-24 crews from the ETO and N.Africa, that volunteered, they were practising in old B-17's for a spell, of a near 100 B-29's then made, only 16 were flyable.....
The point here is, it took SO long to get the B-29 'viable'...... and all that time, the Lancaster was establishing it's legendary, reliable, dependable and deadly service as 'Best Bomber''......... the B-29 finally achieves a reasonable year's service , drops a coupla nukes, and you think that gives it automatic status as the 'best'...... not in my view !!