The best rugby team could not survive a game against the worst NFL team let alone win.
Hehe, keep dreaming buddy. You seen the New Zealand team? The Aussie team? What about the South African rugby team. These guys would wipe the smirk off any NFL players face even if he was wearing a full head helmet and a mouth guard. The most damage an NFL player could do to one of these rugby players is make him more angry and willing to rip limbs off.
You obviously have not seen much Rugby played. I, on the other hand have seen many games of Rugby and many games of NFL. I speak from observation.
NFL = More tactics
Rugby = More brutality, more toughness and more grunt.