We use Stripe as our primary, when Shopify Payments became available in our region (France) it routed through Paypal.
I couldn't see any backend option to select the preferred Shopify Payments backend processor, but would be interested if you have insight into how to achieve this.
In what gives weight to the GP, we enabled Shopify Payments, confirmed it went through PayPal and switched back to Stripe to avoid the "process with PP for a week and then have them freeze your funds for 6 months" grind.
I couldn't see any backend option to select the preferred Shopify Payments backend processor, but would be interested if you have insight into how to achieve this.
In what gives weight to the GP, we enabled Shopify Payments, confirmed it went through PayPal and switched back to Stripe to avoid the "process with PP for a week and then have them freeze your funds for 6 months" grind.