The verdict
These two rarely compete. If you sell software or digital products worldwide and do not want to run tax yourself, I'd pick Paddle. If you are a freelancer or sole trader who needs a business account separate from your personal one, with simple ways to get paid, I'd pick Revolut Pro.
A software business could use both, with Paddle at the checkout and a business account for the payouts. Check Revolut's own page for your market, since features and fees vary. If you incorporate, the vendor points you to Revolut Business, a different product. For a product that sells subscriptions abroad, a payment link will not replace a merchant of record.