well obviously the Denver Broncos because they have won more superbowls then the chargers.
Not this year.
The NFL on CBS - 1956 San Diego at Denver Broncos was released on: USA: 14 September 2008
Denver's record vs San Diego Chargers as of October 11, 2009:53-44-1
TNT Sunday Night Football - 1990 San Diego Chargers at Denver Broncos was released on: USA: 4 September 1994
Through the 2012 season, that was October 15, 2012 when the Broncos defeated the Chargers in San Diego by the score of 35-24.
The 37th game in the history of the Denver Broncos was played against the San Diego Chargers on November 4, 1962. The Broncos won 23-20.
NFL Monday Night Football - 1970 Denver Broncos at San Diego Chargers 41-12 was released on: USA: 22 November 2010
The Chargers did not have a better divisional record. Both teams were 3-3 in the division. The tiebreakers are head-to-head results, followed by divisional record, and then record against common opponents. That's where the Broncos were slightly better.
ESPN's Sunday Night Football - 1987 Denver Broncos vs- San Diego Chargers 12-13 was released on: USA: 29 November 1998
It was on November 18, 2012. The Broncos defeated the Chargers, 30-23.
NFL Monday Night Football - 1970 Denver Broncos vs. San Diego Chargers - 38.17 was released on: USA: 24 December 2007 USA: 24 December 2007
The last time San Diego won in Denver was 10/9/2011. The Chargers beat the Broncos 29-24.