As I've pointed out in the other thread MilleMiglia is a SkyTeam program, there isn't as of yet a program named "Skyteam", each airline has its own FFP. Most of the miles will be earned on the Long-Haul flights, unless you're in a very high booking class, so it might be worth comparing earning rates to see wether you should start with MM or keep your Virgin account. It also all depends on your future movements ofc. Bear in mind that QF, MH and 9W are all AZ partners so you are not lost if your main base is Oceania, even though AZ metal doesn't generally fly to that area a lot.