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Both use oval balls, both have plenty of collisions, but other than that, there's an Atlantic Ocean-sized difference between rugby and American footballNow is the perfect time to get (re)acquainted with both sports, as the NFL takes over Wembley this weekend, and rugby鈥檚 autumn Internationals just around the cornerIf you're still in doubt to which one has the better action, sit back and let NFL legend Osi Umenyiora tell you all about it.