I've worked with a lot of payment gateways like Stripe, PayPal, and some local players. All payment gateways have own pros and cons depend on tax fee, technical requirements, etc.
I've been using it for 2 years and just gonna share my experience with it.
I put some competitive advantages of Shopify Payment to others.
1) You don't need to pay for transactional fees
Shopify charges a processing fee in the same manner as other payment gateways, it set itself apart from its competitors by not demanding any extra costs. So if you decide to try Shopify payments out, be rest assured that all transactions are not subject to the 0.5- 2% extra charges.
2) More efficient checkout process
Shopify Payments allows paying in popular payment methods and local currencies for smooth checkout experiences (Apple Pay, Google Pay included).
3) Multi-currency checkout
Did someone install a lot of apps for currency switcher? And if the user goes to the checkout process currency switch into default...Shopify Payments allows to sell into multiple currencies that help entrepreneurs directly boost conversion rate.