The verdict
If you must pick one for a small business, pick Moneybird. Invoicing, bookkeeping and the VAT return are the work that eats your time at year end, and Moneybird is built around exactly that. Revolut Pro does not do bookkeeping, so you would still need a tool to turn bank lines into accounts.
Pick Revolut Pro if your problem is simpler. You are a sole trader, your business and private money are mixed in one account, and you want a clean separation today. Many freelancers will end up using both: Revolut Pro as the account, Moneybird as the books. Features and fees on Revolut Pro depend on your market, so read the page for your country first.