What on earth is that Uefa Nations Cup I heard about on the old wireless earlier today?
As it's intended to replace meaningless friendlies, it gets my vote, although it's going to be a waiting game to see how serious the higher ranked teams take it. For the lower tiers it should be excellent, gives the likes of Malta and San Marino an opportunity to play meaningful games against similar opposition rather than getting battered into submission every time they enter a qualifying competition.