In what way is Model B better than Model A? Model B shows the types of elements in the compound, but Model A does not. Model B shows the three-dimensional shape of the molecule, but Model A does not. Model B shows how the atoms in the molecule are connected, but Model A does not. Model B shows the number of atoms of each element in the molecule, but Model A does not.
Both models show great detail, however Model A shows a three-dimensional shape of the molecule. This helps scientists and others who are studying the molecule more than Model B which does not have a three-dimensional model.