Family guy first 3 seasons were my absolute favorite. I had the DVDs and watched episodes every night on adult swim. The episode where Peter became a jouster at a medieval fair and the episode where the family had to move down south because chris witnessed a robbery are still to this day my all time favorites.
South park I haven't watched in a while but some episodes that stick out are "the passion of the jew", the WoW episode, and the Somali pirate episode.
Either way I loved both shows