Quoted:
neither will keep the electric bill down as the power (1100W) is constant
220v will incur less % voltage drop and should run more efficiently.
in the real world, that means your item will come up to speed faster (ie: motor, saw, etc), and the lights won't dim when you turn it on...
The 240 V will have lower wiring losses (I^2R, from the current (I) flowing in the sire) and you are paying for those also.
While the motor will deliver the same power, reduced current decreases the other losses you are also paying for (the meter measures real total power, Watt-hours)).
3-phase systems have no special advantage in power factor, except that the POCO charges more for poor power factor and less for better power factor since ht distribution equipment must be based on the V-A load, and a poor power factor means larger distribution equipment without an increase in billable dissipated power (W-hr).
3-phase power often operates at significantly higher voltage, and hits reduces current (and current induced losses) for both the used and the POCO.