Caught the movie Tuesday afternoon, and I absolutely loved it!
It was tremendously fun and had many a fun Easter egg. Some of my favorites were:
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Lois talking about Mxyzptlk (per her saying “Said his name backwards.” as Superman and Krypto meet up with her at the park).
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Fleischerfish.
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Big Belly Burger. Not really an Easter egg, because its right in front of the camera in some scenes, but a nod to BBB is always fun. I would have grinned ear to ear if the Whitty Banter marquee was visible.
I really dug the design for Metropolis, especially LexCorp Tower and how “Lex” was emblazoned across it. Points to Marc Maron for playing Lex as a grubby, scheming jag-off that was fun to hate.
My favorite scene was the introduction of the Justice League. Besides debuting to what sounded like a Sturgill Simpson song that I can’t quite point to offhand, their individual intros were a ton of fun, especially for the characters whose logos were taken right from the comics! 
I really hope we get a sequel, because there’s a lot than can be mined for further stories in the Super Pets DCU.
Also: Whiskers was awesome. “See you in heck!” 
Also, also: Kate McKinnon’s Lulu should be on a list of great DC movie villains. She was suitably menacing, but funny as well.
In comparing LOSP to The Batman (i.e. the DC-related big screen output this year, so far), I’d say The Batman maintains an edge in terms of filmmaking, but LOSP is awfully close. It was well-written, well-paced and it featured an entertaining story populated by well-developed characters.
As far as which movie was more entertaining? LOSP, hands-down, no question about it. It does justice to its source material while also being a fun and innovative movie that anyone, no matter their level of DC knowledge, can jump right into.
The Black Adam stuff at the very end was fun, too. My friend and I were the only people in the audience (of about 30, or so) who stuck around for the credits (as we always do) and the scene was worth it.