The worth of a team in the NFL is usually determined by several factors such as their history, the success of the team, the fan base, value of their stadium, and overall market size.
The LA Rams have a more successful history with more Super Bowl appearances and victories. They were an established team in Los Angeles for nearly 50 years before moving to St. Louis and then returning again to LA in 2016. This has allowed them to build a larger and more dedicated fan base.
In contrast, the Chargers only moved to Los Angeles in 2017, after more than 50 years in San Diego. This move has incurred challenges in building a fan base and setting up a firmly established presence in LA.
Furthermore, the Rams have a more valuable stadium after the 2020 completion of SoFi Stadium, a $5 billion project that is one of the most expensive sports venues ever built. Although both teams share this stadium, the Rams are often seen as the primary tenant.
Lastly, the Rams have benefited from greater overall market leverage. They have capitalized on the Los Angeles market, making more strategic marketing partnerships, which has boosted their value over the LA Chargers.
It’s important to note that team values can change over time. Significant improvements in on-field performance, successful marketing strategies, etc., can greatly increase a team’s value.