The valid table for checked baggage is the one I posted. The other one, posted by Wilsnunn was the first one published in march, but was replaced by the new one (essentially, it was very weird that baggage was only dependent on marketing carrier...).
So if your are Ruby, Sapphire or Emerald, if you want free luggage, make sure to book on AA on AA metal. That way you get free luggage. But then you can not choose seats for free.