Rugby vs. NFL

Throughout my days on the planet, I've been involved in a few 'discussions' about the differences in these two sports

Here's my opinion:

NFL: relativly, it's more about power, strength, specialization, the hits are harder, the game is very tactical (execution is important)

Rugby: it's more about stamina, versitility, the hits are more dangerous, the game is less tactical (spatial awareness and spontaneity is important)

Both sports require talent

Anyone else care to add their view?