Every metal can be finished with either a high polish or a brushed satin finish.
The high polish surface is simply devoid of any scratches. You can see your reflection in it and therefore resembles a mirror surface.
The brushed satin finish is the opposite. It has a series of microscopically small scratches. These brushed scratches scatter the light and you therefore do not get a reflection.
There is not such thing as the best finish, just personal preference of which one you prefer.