No airport: the way in is through Zurich or Feldkirch
Liechtenstein has no airport of its own. Most visitors fly into Zurich, take the train to Sargans or Buchs on the Swiss side, or to Feldkirch in Austria, and finish with a local bus to Vaduz. A Liechtenstein pack only gives data on FL1 and 7acht, so it does nothing for that transfer: the whole ride from the airport runs on Swiss or Austrian networks. A Switzerland pack stops working at the border just the same.
So decide by where you sleep. If the trip includes nights in Zurich, Lucerne or the Vorarlberg, the 33-country Europe pack below keeps one eSIM working across the three countries. If you only need data once you are here, for meetings in Vaduz or a few days in the valley, the Liechtenstein pack is enough: install it at home, cover the transfer with an offline map, and it starts the moment you are in.