Visa/Mastercard is more of a card network, while Adyen is an end-to-end end-to-end payment provider that offers merchants a complete solution directly. Adyen has even more growth potential than the two in my eyes. Visa/Mastercard are "quality stocks" rather than "high growth plays".
@paulomat Yes, you're right. But compare the chart. It clearly speaks in favor of Visa, for example. Steadily upwards, which is not the case with adyen
