This Washington Post article profiles research by a consultancy on the world's "most powerful" passports.
The ranking puts the U.S. and U.K. passports first, giving access to 147 countries without an advanced visa. France, South Korea and Germany are second, with access to 145 countries, followed by Italy and Sweden in third; Denmark, Singapore, Finland, Japan, Luxembourg and the Netherlands in fourth; and Switzerland in fifth. Advanced economies dominate the top of the list. Hong Kong comes in at 11, while Argentina and Israel are ranked 16th. Brazil ranks 17th, Mexico 22nd, the Russian Federation 35th, and China 45th. The least desirable passports according to this ranking are from the Solomon Islands, Myanmar, South Sudan, Sao Tome and Principe and the Palestinian Territories. They rank in 80th place, giving access to just 20 countries each without an advance visa.