Some things to consider… kids. The hollow doors are easy for them to break when fooling around or angy. The solid ones slam much louder. The better sound dampening of the solid ones can be good if you don’t want to hear thier music. But bad if you want to be able to yell “dinner” up to them. Also, if you knock, you may not be able to hear them answer as easily.

And bonus advice, if you have the interior walls open, put insulation in the walls between the masterbed room and any other room. It reduces sound transfer through the wall, which is nice for a variety of reasons…