Just how “powerful” is your passport? In other words, how mobile does it allow you to be in terms of entering other countries without needing a visa, or at least yield you a hassle-free visa-on-arrival, eTA or eVisa issued within a few days.
The Passport Index aims to calculate the relative ability of different nations’ travel documents to open doors for travellers through various metrics. These days, COVID has added an additional level of complication, but it’s all taken into account on this website (which is also an app) and if you’ve got two (or more) passports, it can help you figure out which one to travel with.