Rushmore was the first Wes Anderson movie I saw and the first one I fell in love with, so if we were going with my PERSONAL preference for a rocket-ship Wes movie that would be the one for me. The Royal Tenenbaums is one I originally appreciated from more of a distance: like, I could see that it was well-made and that the performances (especially Gene Hackman) were great, but I found the dollhouse aesthetic a little stifling compared to the Anderson's previous movie. Returning to it now, after all the other Wes Anderson stuff that has come out since, I'm better able to feel its greatness. A lot of the scenes caught me up emotionally more than before, maybe because I've now had a bit of distance and see where the careers of the Wilson brothers, Paltrow, Stiller, etc., have gone, and also now knowing this was Hackman's last great role. Given this movie's incredible lifespan in the cultural consciousness and the way it basically set the Wes Anderson Style as a template for a new generation, I'm comfortable with voting yes on this one, even if Rushmore, Moonrise Kingdom, and Fantastic Mr. Fox might be higher on my personal list (I need to revisit Grand Budapest, which is another one I appreciate but other people went more ga-ga over than I did).
It's interesting that Paul brought up near the end of the episode how the characters/performances seemed a bit "amberized," but I don't think they discussed the movie that is the most obvious inspiration for this one: Orson Welles' The Magnificent Ambersons. A lot of the same stuff going on in both of them: a well-off family that falls into disrepair, the movie retroactively seeming like a big commentary on the filmmaker himself, etc.