In 2026, the choice between Suica and PASMO is largely a matter of convenience, as they are functionally identical and 100% interchangeable for travel across Japan. Both are "tap-and-go" IC cards used for trains, buses, and even vending machines. Historically, Suica was issued by JR East (trains) while PASMO was issued by private railways and subways. For a tourist, the "best" one is simply whichever you see first at the airport or station. However, Suica is often considered slightly "better" for international travelers because its mobile version (Mobile Suica) has historically had better integration with Apple Wallet and international credit cards. Additionally, the "Welcome Suica" (the tourist-specific physical card) has a simpler vending machine process at Haneda and Narita airports. If you are starting your trip in Osaka or Kyoto, you might get the ICOCA card instead, which works exactly the same as Suica and PASMO throughout the entire country.