After reading some reviews about Parasite, it seems to imply that everyone in the movie is a sort of villain. I don't know if I am just overanalysing it or not, but it seems to propel a sort of love/hate relationship with rich people that is evident in modern society, where people keep fetishising wealth but also hate the wealthy. Without spoiling the movie, it seems to me the rich family was a little mischaracterised with their behaviour not really warranting the kind of actions taken against them. I can understand the message the movie was trying to make, but I think that it could have been written a bit more appropriately.
Finding Nemo is a well made family movie, back when Pixar had a high standard of quality in both animation and in storytelling. The characters are written well and having a father and son as the main focus of the movie is quite unusual in 21st century films. Dory also being a main character allows for a more expanded take on the father/son movie with a little bit of exploration of some unusual character quirks as well. Having the base of the story being about the desire to reunite a family is a nice change to the more brutal/empty movies of today (including some kids movies).
I voted for Finding Nemo because I think that it represents a good film that can be enjoyed with the whole family and has a nice message for younger viewers to ponder. Parasite seems to be wanting to send a message but I think that more practical actions to right wrongs are what is needed rather than short term attempts at achieving balance, such as the actions taken by the poorer family as shown in the film.