So as it stands right now, San Diego holds the edge in games against common opponents. They're currently 8-2 against common opponents with games left against Miami & KC. The Broncos are 7-3 in games against common opponents with games left against Buffalo & Oakland.
Both teams are currently 3-1 against the division. San Diego has to play at KC & home against Denver. Denver has a home game against Oakland and a trip to San Diego.