Which type of horseshoe magnet should you choose?

The ideal type of horseshoe magnet to use for educational purposes would be the pocket horseshoe magnet. This is because it is small and lightweight, so would be handy for highlighting the magnetic field of a horseshoe magnet on a small scale.

For large scale industrial use, the best type to use would be a power horseshoe magnet. This is because it has the greatest magnetic strength to lift and sort through large quantities of corrosive materials for anything ferromagnetic.

The ideal variety of horseshoe magnet for the sorting of ferromagnetic and non-ferromagnetic materials on a conveyor belt would be the channel horseshoe magnet. This is because they can easily be lined up side by side along the entire length of the conveyor belt due to their elongated shape. 

If you intend to use a horseshoe magnet as a magnetic base, then the best variety to choose would be a button horseshoe magnet. This is because it is compact and strong, with a clearance hole to attach any stands or equipment. 

For welding pieces of steel together, the best type to use would be a power horseshoe magnet. This is because it has a greater depth and smaller air gap than any of the other varieties of horseshoe magnet, this allows it to hold large pieces of steel easily.