It is also subjective, the ceiling height the light outlet placement, the size of the room, the decor etc. we would need to see the space in order to help you, other wise, we would all end up just giving you the same examples you have read about.

This is the master bath layout. 9 ft ceilings. Will have a 42 vanity on each side with a tall cabinet next to each side

Kids Jack and Jill bath have their own 60” vanity. 9’ ceilings

Were any of those various things you read about concerning the drawbacks of jack and jill bathrooms, closets where hanging clothes turn corners, corner rooms with windows on only one wall, views into bedrooms from living rooms, clothes closets only accessible from a bathroom, or being in small confined stinky spaces?