The methodology of these calculations are given here.

In both the Formula and SRS, Philadelphia is preferred. The difference in the Formula is so small that you can assume ‘pick ’em’. Philadelphia is favored by around 3 points using offensive stats.

Super Bowl Odds
Home Team Visiting Team Score Diff Win Prob Est. Point Spread
Philadelphia Eagles Kansas City Chiefs 0.091 0.52 0.7

By the time you reach the Super Bowl, my formula reduces from a 3 component formula to a 2 component system. There is no home field advantage in the Super Bowl.

Super Bowl Odds SRS Based
Home Team Visiting Team Score Diff Win Prob Est. Point Spread
Philadelphia Eagles Kansas City Chiefs 0.453 0.611 3.4

Just a note. I’ve had plenty of fun in the run up to the Super Bowl reading Scott Kacsmar. He has some unique points of view, well worth reading.