Which of the properties of atoms is the most suitable reference for the kind of band that will take place between them?

The most suitable reference for the type of bond that will form between atoms is their electronegativity. Electronegativity determines how strongly an atom attracts electrons in a bond, influencing whether the bond will be ionic (between atoms with significantly different electronegativities) or covalent (between atoms with similar electronegativities). Additionally, atomic size and ionization energy also play crucial roles in determining bond characteristics.