Here's my rationale: I think the NFC was weak this year compared to the AFC. The Chiefs faced a much tougher opponent in the championship game than the Eagles. Andy Reid is a hall of fame coach, KC has the edge there. Sirianni may turn out to be great, but it's early in his career. Do not underestimate Patrick Mahomes. Chiefs have the edge in QB.
The exception for all my rationales: The Eagles vs the Pats. Pats had better coach and QB and still got rolled. So I can see the other side.
I don't like either team much - Philly fans are obnoxious as heck and I cannot stand that fake / racist injun chant in Arrowhead. Nothing like a crowd of white people from Missouri and Kansas playing indian on national tv.