Here's my take.
First, I don't believe it's a good idea to compare teams/eras with how you believe they would have fared in a hypothetical match up -- specifically when there is a large gap in between. If that's the case, a current team is always gonna come out on top against a team from say 30 year earlier. Evolution of the players and the game. Better playing surfaces. There's really no way to fairly compare.
So I judge things more by how they stacked up and compared to the teams/players of their respective era. One reason being is, if the players from say a 1975 team were magically transported and raised in this era, they'd be better athletes/players than they were during their own time. Conversely, a modern day team transported back in time and raised in that era would be limited by the evolution, technology and knowledge of time.
Regarding Folsom, I'm not convinced this current team is better than their 2014 team. Better offensive skill players at the WR and RB positions? Absolutely. But 2014 had the better QB and more talented, physical line play -- on both sides of the ball. So not only do I debate 'best team in SJS history', I debate best team in Folsom history.
While the 2014 team wasn't vetted against DLS, some are forgetting that they put a running clock on all 16 opponents. Like this 2018 team, they also destroyed an undefeated section champ (Grant Union). That team also followed that up with a 61 point win in their SBG.
I also think Folsom's 2010 team had comparable offensive skill talent with Dano Graves (Nat' POTY), Jordan Richards (NFL), Tyler Trosin and Kori Babineaux, but their offensive line and defense keeps them out of the greatest Folsom team discussion.
I think it's fair to compare those 3 teams because they all played within an 8 year period. Same era.
But with regard to best SJS ever, I still believe that title rests with 1975 Cordova. While there was no CIF playoff system for D1, they did win their 2 Capital City playoff games, finished #1 in CA, and were voted Mythical Nat'l Champs. There's no higher honor to be had. So for that reason, they still have the strongest argument for #1 ever in the SJS.
I also believe 1985 Cordova, 1997 and 1998 Elk Grove, and the 1996, 2006 and 2008 Grant Union teams (based off accomplishments and records) all have strong cases, along with 2014 and 2018 Folsom.
Lastly, unlike many, I tend not to totally discount teams such as 2009 and 2010 Grant Union that were upset while playing in an abnormally strong playoff field and/or under unusual circumstances. But I digress.