AIP numbers versus Elektroboot performance

With all else equal at the end of the Second World War, which would be more dangerous: air-independent-propulsion boats or Elektroboote?

He favours AIP boats because he expects more of them could be built.

Air-independent-propulsion submarines are the preferred answer because more of them could probably be built than Elektroboote. This does not mean that one AIP boat would outperform a Type XXI in every respect. Instead, wartime danger becomes the product of individual capability and the number of boats that can actually enter service. The exchange provides a compact reminder that industrial scalability can matter as much as peak platform performance.