I used a bench top drill press for many years. I found I did not like the height of the machine when mounted on a bench so eventually made a stand so I could get the machine at my desired height.
I eventually upgraded to a floor standing machine. I would not want to go back to using a bench top machine.
The typical floor standing machine has larger motor, larger swing, more quill travel, bigger table, perhaps bigger diameter on the chuck, all desirable features in my view.
I was easily able to bog down the motor on the bench drill press which I think is 1/3HP. No power problems with my 1 HP floor standing unit.