The thing about parawellness that gets me a little versus metametrix is that metametrix gives three days of samples to give in where as I think parawellness only does one day so it seems like maybe they have more a chance to miss some stuff cause it's one sample rather than three- just an idea though.
also metamatrix is a little cheaper, it's around half the price. if it came down to it parawelless is an option tho but i feel like maybe metametrix might be better to start with