The fleet boat is the better offensive weapon, but as has been pointed out, the odds of it surviving against determined ASW are worse. Active radar in particular would have been a dead giveaway. The Type XXI was, of course, the best sub of the war- by far. I'd take the evaluation of their enemies with a grain of salt- especially given how feared the U-Boat threat was. But I'd concede that by that time in the war, manufacturing was a crucial liability to the type.
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