Here's why I'm tilting KC, and its all intangibles:
LAR don't have a proper home field advantage. Fan base is relatively new and the stadium has a lot of visiting fans. And it's the regular season so you should expect Andy Reid to be an excellent coach with innovative plays.
My wife, is far more active on daily fantasy stuff and is a bit more analytical, and is leaning LAR, mostly because KC has no defense. LAR isn't much better on the defensive side, but they are still better. My wife is usually right about these things; fwiw she's horrible at analyzing the eagles.