Total Recommendations: 2
They're both parodies and you always see those parts where they censor some words because they cannot broadcast other shows in their anime.
They're quite different from one another. Lucky Star will make you laugh while Clannad will make you laugh and cry :) Oh and Lucky Star characters have similar looking characters in Clannad. Kagami - Kyou, Tsukasa - Ryou and Konata - Fuko