Clear Difference between DFSDM and SAI

In our previous design we were using DFSDM to read the microphone data, but with the STM32WB family there is only SAI PDM port. I read that the SAI consume more power than the DFSDM because it is processing PDM to PCM.

I found also that the DFSDM is more light than the SAI with the acoustic beamforming

https://community.st.com/s/question/0D53W00000W674p/is-there-a-way-to-use-st-acousticbf-from-xcubememsmic1-lib-in-pdm-mode-to-use-together-with-dfsdm-peripheral-we-can-also-use-sai-peripheral-for-46-microphones-so-what-is-better-sai-or-dfsdm

I am looking for a clear information about the main difference between these two protocol of communication in matter of CPU resources, computing, performance and power consumption.