Both dig. The difference is everything around the digging: how you get to the hole, how you move the machine, and what you do with the spoil once it is out of the ground.
A mini excavator rotates 360 degrees on tracks and fits through a gate. A backhoe drives itself down the road and loads with the front bucket. Pick by access and transport, not by dig depth.
Choose a mini excavator when the work is tight, finished, or trenched — which covers most residential and utility work. Choose a backhoe when you dig and load in the same day on open ground and want to drive between sites without a trailer.
The most common regret we hear is a machine that cannot reach the work. A 1-ton excavator with retractable tracks clears a 36-inch gate. A backhoe never will — you are removing fence, or working from the driveway with a longer reach and more damage.
If most of your work is behind a house, on a finished lawn, or between structures, the excavator wins before the spec sheet opens.
A backhoe is two machines: a digger at the back and a loader at the front. On a day where you dig a trench and then move the pile, load a truck, or carry pallets, that saves a second machine and a second operator.
It also drives itself between nearby jobs at road speed. If your sites are spread across a farm or a small town, that alone can outweigh everything else.
The purchase price gap is wide, and the running costs follow it. A small mini excavator burns a fraction of the fuel, needs a lighter trailer, and puts less wear on tires and drivelines. A backhoe carries road-legal maintenance and heavier tire costs.
Small contractors regularly land on a mini excavator plus a compact loader for less than one backhoe, and end up with two machines that can run at the same time.
For confined residential and utility work, yes — it rotates fully, fits through gates and does far less lawn damage. For open ground where you both dig and load, a backhoe does the work of two machines.
Not in the same class. A 1-ton mini digs around 6 feet and a 3-ton around 10; a full-size backhoe reaches 14 feet or more. Match the machine to your deepest real hole, not your worst-case one.
The mini excavator, by a wide margin — lower purchase price, less fuel, a lighter trailer and cheaper undercarriage maintenance than road tires and drivelines.