Slide rule vs iPad

This is an image of my slide bought in 1963 and my iPad, a present given to me in 2013, fifty years apart.

William Oughtred and others developed the slide rule in the 17th century based on the emerging work on logarithms by John Napier

The first iPad was released on April 3 2010 by Apple Inc.

Which is better?

The slide rule can be used to make calculations out of the box.

The iPad needs to have a calculator app. downloaded from the Internet

Checkmate