When going to Finland, you can choose to apply for a visa or a mastercard. Finnish restaurants, shops, taxis, hotels and other commercial places accept various major credit cards.
Visa card has more complete service facilities in the United States, so it is used more in the United States. Mastercard is more used in Europe, so if you go to Finland, it is recommended to choose Mastercard.
There is no difference in usage between visa and mastercard. They are both credit cards. However, Visa is highly accepted in Asia, Australia, and North America, and Mastercard is highly accepted in Europe.