Wild Keccak is also very energy efficient, and there are no ASIC's!  Boolberry's scratchpad is currently around 400mb, which requires it to be stored in global memory vs Cryptonight which is 2-4mb depending on original or "heavy" version.  Wild Keccak PoW calculation is <1ms and cryptonight is 30-100ms.  (Eth is roughly 3-4ms iirc). So I'm not sure what you mean when you say efficient, but WK beats CN at every metric we've considered.

In summary,  WK is not only faster, but much more ASIC resistant than cryptonight.  We will be modifying WK and be releasing WK2 which will make it even more ASIC resistant going forward.