Excavator is very common vehicle of earthwork job generally it arm can be fix with different size bucket to carry out excavation job, also can fix with hydraulic breaker for concrete breaking.
In advantage compare to backhoe is the track chain link (wheel) which can move at bad ground condition.
Excavator will transfer from site to site using low loader truck. Short term of rental period will incursignificant cost.
Special type of excavator such as barge attached excavator which used for river digging and widening job.