Both games are great, so no worries with whichever you pick.
AC/DC is a bit more subtle than MET. MET can be kind of a bash-fest. But CIU is exquisite.
AC/DC has one major flaw. People get locked into a strategy that gives them the most points. They play it the exact same small way over and over, and they get bored with it. They play like every game is a tournament. That's a shame because they miss out on a game that has so much to offer.