Well, I have an AZ Skyteam Elite + card (through a status match ), however, I would not recommend the AZ MilleMiglia program unless you plan to take a lot of AZ or AP flights or unless you plan to fly a lot in business class.

Most Skyteam partner flights earn either 0% or 50% in economy. KL / DL / NW T class = 50%. The best KL offers book into V class, earning a staggering 0% on AZ