It's hard to name my favorite with certainty, but one of my favorites is The Incredibles. The world building, the score, the action, the comedy, the relationships. It's all great.
The stakes are very real too. Syndrome is willing to murder not just superheroes, but kids. When he orders Elasti-Girl's plane shot down knowing it has her and Bob's kids on board, you feel every bit of tension as Helen tries to stay calm while doing everything she can to save her kids. The scene is even more believable because the way she uses pilot jargon while speaking through the radio.
And the themes! Each main character's power is tied to their role. Super strong Bob being weighed down with the crushing burden of mediocrity. Over functioning Helen has to stretch herself to take care of everyone. Super fast Dash has too much energy and resents being contained. Insecure Violet just wants to be invisible to the world. Even baby Jack Jack is just full of possibilities.
Honestly I could go on and on. It's a movie that's suitable for kids but has some very grownup themes and relationships. It hits different after you have kids, feeling what the parents are going through on a new level. To me it's not just a great superhero movie, it's just a great movie that most people can find something to relate to in.

Arcane season 1 is one of the best shows, live action or animated, that I've seen. It is 10/10 storytelling, world building, visuals, pacing, character development, voice acting, soundtrack...it has no right to be as good as it is. If you watch it, know that the 9 episodes were intentionally released 3 episodes at a time because they're like acts of a play.
Do you like strong women? Character choices that make sense? Commentary on social structures? Creative portrayals of trauma? Stories where the consequences are terrible because everyone really believes they're doing the right thing, and you can see everyone's point? Welcome to Arcane, where the H stands for Happiness.
Season 2 is...meh in my opinion. It has cool moments but they shifted from a character driven story to a plot driven one and it throws off the pacing and suspension of disbelief. Still gorgeous to look at.
But season 1 is worth it on its own. Others may disagree, but I think if they had ended it where they did with season 1 it would be a perfectly self contained story.