Explain similarities and differences between metallic and ionic crystals ?

Similarities: In both metallic & ionic crystal
i) Bonds are non directional.
ii) have electrostatic forces of attractions.
Differences:
i) Ionic bonds are strong where as metallic bonds are may be weak or strong
ii) Ionic solids are bad conductors (in solid state) but metallic solids are good conductors of electricity.
iii) Ionic solids are brittle, but metallic solids are malleable & ductile.