To be honest, neither the Stereo Beru or the Mono Beru sound all that natural to me. Mono Beru felt like she stressed the wrong syllables sometimes.
I wasn’t speaking of performance, only sound mixing. The stereo Beru is noticeably dubbed. The mono Beru seems as well dubbed as Owen and seems to fit nicer in the mix. The stereo Beru has always stood out to me as being way too obviously dubbed and that bugs the hell out of me.