Many thanks for your interest in our extensions.For your concern, I'd like to confirm that:
1. BSSCommerce Checkout with Display Currency for Magento 2 allows customers to checkout with display currency - it means that customers can pay in various currencies in 1 storeview, just by changing the display currency on currency switcher. Thus, it helps improve UX. In contrast, about Administration, it does not change anything - the price would be converted from Base currency (which has website scope as default) to display currencies via Currency rate through the website, Admin cannot set price per currency.
2. BSSCommerce Multiple Store View Pricing for Magento 2 allows admin to set Base currency for each storeview. Then, customers could pay in 1 Base currency with the price Admin set up in 1 store view (display currency is not used in checkout and payment as default). Currency rate would not be used to convert price between currencies, admin can set price in each storeview as their needs. Using multi-storeviews helps save Administration time (easier management) and code requirement/server storage rather than using Multi-websites.
I hope that the info is helpful. Could you please check our demo sites also to see which extension meets your needs?
If you have any further queries, please feel free to contact us at firstname.lastname@example.org or create a ticket. We'd like to help you.