A number of years back Naas Botha, one of the best flyhalfs in South African history tried to make it playing in the NFL, but was not able to. These games are very different, and people can't switch from one to the other at a high(professional) level. While they are big and fast, most people in the NFL would not hold a candle to "professional" rugby players. Bottom line...Both games are fun to watch, even though I prefer Rugby.
Supporter of the "A happy fredster is a muted fredster" fanclub.