Prob the AGC as the difference of various mic sensitivity is little especially mems that are all approx in the same ballpark.
For every doubling of distance , the sound level reduces by 6 decibels (dB) hence there is no magic far field mic just gain that AGC will auto adjust.
The SNR limits the gain as too much gain gives too much noise…
I don’t think the quality control is too good on the keyesstudio and prob a good chance it might be a bad one otherwise I think they are the same.
I don’t bother with them as without beamforming algs 2x omni-electret is 1x pointless and summing out of phase mics makes a psuedo high pass filter, so really you end up with a single omni mic on a pcb that is near impossible to isolate.
So yeah I have a keyesstudio and wouldn’t recommend it but for me the respeaker is equally pointless.