They are both European capitals.
Lisbon is in Portugal, Sofia in Bulgaria and Vienna in Austria, but Vaduz is in Lichtenstein.
Vienna, Australia doesn't fit. Lisbon is in Portugal, Sofia in Bulgaria and Vaduz in Malta, but Vienna is not in Australia, but rather Austria.
Vaduz Malta is probably the one, since the rest of the cities listed are both on the European mainland and are capital cities.
Vaduz is the capital of Liechtenstein.
Vaduz's population is 5,342.
Liechtenstein's capital is Vaduz.
The population of Vaduz, in July 2009, was 5,091.
The capital city of Liechtenstein is Vaduz
FC Vaduz was created in 1932.
The area of Vaduz is 17.3 square kilometers.
Vaduz is the capital city if Liechtenstein.
Valetta is the capital of Malta and Vaduz is the capital of Lichtenstein