What is stronger on a wheel design. Forged wheels or spun wheels.

Spun wheels are just a flat like sheet metal and forced into place.

Wait!! is spinning a type of forge process?

Just recently the local news here featured a local man that was still using the old hand method of spinning as shown here http://prl.stanford.edu/documents/pdf/spinning.pdf
Al.

cool I just want to know what would make a stronger wheel. Forged or spun wheels