Cleveland Show is kinda more like what Family Guy originally was, in terms of things being slightly twisted versions of more standard sitcom plots. Don't think it's very good but seems to have one good joke an episode.
American Dad is a masterpiece. It's become like King of the Hill though in terms of how FOX treats it.
American Dad and Bob's Burgers are far and away easily my favorites of the FOX animated shows.
American Dad from about halfway through season 2 becomes pretty special.
They ditched the whole conservative dad vs. liberal daughter sitcom premise and turned it into something probably better described as an action-adventure comedy.
Most importantly they reversed their position that Roger couldn't leave the house.
The Christmas specials are some of the most amazing episodes. I always look forward to those.