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3 Phase motors have very good power factor as compared to single phase. Due to this reason 3 phase motors on produce less reactive power which is mostly cause of loss in kind money. The other benefit is , there is no use of capacitor for starting 3 phase motors while 1 phase have. 3 phase motors are more energy efficient for larger capacities.
three motors and other load is easy to use . three phase is low current for motors . single phase is highcurrent . running and silent is very good for three phase motors. especially three phase is necessary for jobs.
your question is not complete. Selection of single-phase (or three-phase) depends primarily on the type of object (installations), and of the demands of installed (or simultaneous) request forces.
Also if it is not possible to fulfill the condition of symmetry of loads (AC system), cost-effective of single-phase supply is the correct decision... etc....
Three phase systems are more efficient compared to single phase since it produces power with lower losses compared to single phase. Moreover, Less pulsation compared to single phase systems in case of machinery systems and hence lower noise produces in three phase machines.
Three phase i.e.3 Phase motors are more Horsepower efficient and less maintenace/ complexity compared to single Phase
