Advantages of AC Motors:
Low cost,
long life,
high efficiency,
large ratings available (to 1 MW or more),
large number of standardized types.
Disadvantages of AC Motors:
Starting inrush current can be high,
speed control requires variable frequency source.
Advantages of DC Motors:
Precision positioning,
High holding torque,
Long lifespan,
Low maintenance,
High efficiency
Disadvantages of DC Motors:
Some can be costly,
Require a controller,
Higher initial cost,
Requires a controller.