Neither, Same format. Dumb dad, keep in check mom, dumb son, smart daughter and a baby.
Simpson is all the personality and Homer is modeled after Matt Groening dad. Good show but stopped watching it after season 10 or 11 prime time. All time fav episode is the Bond spoof with Scorpio as Homer owns the Broncos at the end. As Marge said "what is wrong with owning the Broncos?" And Homer says "Honey you don't understand football".
Broncos won it the next year beating the Falcons.
American Dad is the best one to watch in the modern. The Ricky Spanish episode is a must see. On Netflix.