In 2018, eBay (NASDAQ: EBAY) announced it would part ways with its former subsidiary PayPal (NASDAQ: PYPL) and transition all of its digital payments to the smaller Dutch company Adyen (OTC: ADYE.Y) over the ensuing five years. Over the past five years, PayPal's stock has dropped 25% as Adyen's stock rose nearly 150%. Let's review the differences between PayPal and Adyen, why the former underperformed the latter, and if PayPal will remain the weaker overall investment.