Tribes and bands are all interchangeable with nation in modern day language. They were once different and tribes/bands were used to describe non-western nations, often in a derogatory way.
And again whether or not it is better would be based on your point of view as I have stated previously.
And one rose to prominence based on force and killing - so yes it was a superior force, not necessarily a superior way of living. And they did it with no regard to the culture that was already there.
In current times, we see the opposite, whereby the white colonists insist that anyone coming to settle must live in the white way and existing culture, and can't bring their culture and force and see which prevails as the strongest.

