To be honest, I didn't really like Clannad at all. I loved all the other heroines, except for Nagisa. She honestly was a super uninteresting character, but I guess she was a perfect fit for the main dude.
Anyways, I'd say it's honestly Evangelion. I'd like to say other things are comparably more satisfying, but Eva's hit me the hardest. Code Geass was definitely cool, though.