For Manjaro? I guess for a long time it will be pulseaudio. Pipwire is in testing stage, and like you can read in project wiki at the moment it’s only to play around not for daily/production use. It’s from what I’ve understood.
If PA works on your machine without issues, there is no reason to switch in my opinion. Theoretically there is a higher chance that you face issues with pipewire than pulseaudio.