I'd like to see performance vs. PayPal.
I launched a project a month ago (a desktop Windows app) and only had the Stripe checkout. Guess what? No one outside SV and HN has any idea what the heck Stripe is and half of them "don't feel like giving you my credit card info" even though it says right there that it goes directly to Stripe. So after 2 weeks I grudgingly added PayPal and added itsy-bitsy hard to find link to it on the checkout page... Drumroll... nearly 50% increase in sales!