COSTA MESA — Here’s all you need to know this season about the respective entertainment potential of our two NFL teams:

The Chargers’ reactions figure to be more fun to watch than the Rams’ actions.

That, at least, goes for the offenses, where the difference between these teams likely will be no more obvious than Philip Rivers’ occasionally volcanic on-field retorts.

“He loves going out there and beating a blitz right in the teeth, throwing it hot, like a 3-yard throw but it goes for 45 yards,” offensive lineman Matt Slauson said of the Chargers quarterback. “That just juices him up. Then he looks over at the other side, at their defensive coordinator, and he’s just jawing at him. He makes it so much fun.”

Fun is not a word anyone would use to describe the Rams’ offense, unless they think it’s fun watching 11 men stuck as one on a treadmill that’s broken.

The Rams have had a two-season hold on being the NFL’s worst team with the ball, both statistically and aesthetically, this group capable of losing 2 yards during the national anthem.

With their training camps this summer separated by barely five miles, the Chargers and Rams today will be in even closer proximity, the “Fight for L.A.” coming together in Carson, at the StubHub Center.

The teams will share a field for practice, though their offenses will arrive there from seemingly different planets.

When in possession, the Chargers can deliver a KO. The Rams, conversely, would be much improved in 2017 by simply being OK.

“We want to score as many points as we can score and score a lot of them,” Rivers said. “We’ve done that over the years in the last decade, and we expect to do it this year.”

Like always in this sport, offense starts with the quarterback, where Rivers is experienced, accomplished and revered, all the things Jared Goff might be one day but isn’t today.

When Rivers reported for his first NFL training camp in 2004, Goff was 9 years old. Comparing them now seems just as starkly comical.

Goff has thrown for 1,089 yards all-time. Rivers has thrown for 26 miles, a fitting total for a nonstop marathon man who has started every Chargers game since 2006.

Rivers has 97 regular-season NFL victories. Goff is 0-7 as a starter, his most recent win coming over Air Force in the 2015 Armed Forces Bowl.

Goff has five career touchdown passes. Rivers had five touchdown passes last season after Week 2.

“We have all the potential that we need,” Slauson said. “But the thing about potential is that it can be a huge insult, too, if you never realize it. You have to go out there and do it.”

The Chargers’ offense last season – and remember, this was without wide receiver Keenan Allen for all but one game – scored 43 touchdowns, 20 more than the Rams’ offense did.

If that doesn’t sound like an ominous enough gap, consider that Pro Football Focus, in ranking the talent on every NFL roster, recently put the Chargers at No. 8 in the league and the Rams at No. 31.

The Rams actually came in two spots behind the Cleveland Browns, which is almost as jarring as a rainbow losing a beauty contest to the color brown.

Now, if you’re like me, maybe you’re also wondering how a team could have the eighth-most talent in the NFL yet have only nine victories over the past two seasons.

Fair question, certainly, although this column isn’t about the Chargers underachieving as a group as much as it is about the Rams achieving so little as an offense.

Both these teams have reworked their offensive lines, and the Rams did add a veteran wide receiver in Robert Woods.

But, honestly, watching their practices at nearby UC Irvine, the Rams still look like an offense painfully lacking in highlight-producing options, and this after a season in which they scored one or zero touchdowns 10 times.

The Chargers had just two such games and are talking now about dropping that number more.

“I think you already know the answer to that question,” wide receiver Dontrelle Inman said Friday when asked about the Chargers’ big-play chances. “We have a lot of weapons.”

And they also have a quarterback, Rivers serving as a definitive answer at a position, throughout the league, clouded with nagging questions.

Yes, he famously wears his emotions on his sleeve and on his pant legs and all the way down to the bottoms of his cleats.

But Rivers also has been a steadying presence at a position where the Rams, for now, can only hope they’ve discovered their foundation.

“Philip’s experience and knowledge of this game is absolutely incredible,” Slauson said. “And he might be the most competitive guy I’ve met in my whole entire life.”

Entering this joint practice today, the “Fight for L.A.” remains very much undecided.

The “Fight for the Entertainment Capital of the World,” however, appears to already be over.