For switching 220VAC, is a specific coil voltage and coil resistance better than another?
Relays coils is a current-driven device.  If you can apply the specified voltage across the coil, there will be sufficient current and the relay will click.  Ohmic losses in the winding is about the only difference.

+5V, +12V, +24V are some of the common supply rail voltages.  Of course, the makers of the relays want to make relays for various systems.  That's the rationale behind having a family of similar relays with different coil voltages.

P.S.  Don't forget the protection diode in parallel with the coil.