Cal here from Shopify, thanks for reaching out to us. How are you keeping?
I'm sure the Community will be happy to provide you with some awesome feedback on this. Could you share the region you are operating from, as gateways tend to differ in availability in different regions.
You can find a comprehensive list of available gateways here by selecting your region.
If you were looking to use Apple Pay or Google Pay you can read more about these accelerated checkout options here. In most cases, they are available exclusively to merchants using Shopify Payments, so if you are in a supported region, I highly recommend this gateway. You can read about the rates here, it will vary depending on your plan.
Let me know your thoughts or any further queries you may have!