The Lancaster had advantages nonetheless - less crew, much greater bombload, [ up to 3x a B-17] manoeuvrability [as mentioned] which in fact saved alot from fighter destruction, and it WAS rather hardy but not as 'ironclad' as the B-17, weight/bombload/range being the order of the night, and I don't think anyone accurately knows just how many nightfighters Lancasters shot-down, there was no way to see! As soon as they were attacked and gunners fired, the 'corkscrew' evasive-manoevre was effected... They also carried more comprehensive radar and bomb-aiming equipment, resulting in more accurate bombing - 61 Sqn.'s of Lancasters flew 156,000 sorties dropping 608,612 tons of bombs....together with B-17's from 47 GROUPS,[!], they carried-out 6945 missions, dropping 164,000 tons of bombs on Europe. To argue one's better than the other is pointless really: In tandem, around the clock, they succeeded in distorting Germany's production, incurring economic ruination and ultimate collapse of their ability to wage war any more...I like BOTH aircraft;- My countrymen flew Lancasters, at great cost also, and my reading of their deeds does allow a patriotic favouritism to colour my preference....