Boas seem to typically be more docile
than carpets. I have handled both and I have come
across mean carpets a few times but never a mean boa.
carpets are sometimes nippy when young and some don't tame
out but must do. Carpets are more active which makes them cool but id say you would need a carpet for a long time
before trusting it with a child. Though I have never been bit by one I heard even tame carpets are become aggressive rather easily.