I don't think I've ever seen Second City Television. If I had, then it's simply a forgettable show.
However, I have seen The Brady Bunch, and there is NOTHING forgettable about that unbelievably awesome sitcom. Today, I can't really pop in an episode and enjoy it, but man... as a kid, I fucking loved the show. Why? I don't know, I just did. All the storylines intrigued me, and it simply made me laugh. Every single character was likable, which isn't something you can say for most sitcoms or television shows period, and I just dug the show. What more can I say?
So, yeah... The Brady Bunch gets my vote here, without a doubt.