The verdict
If you run a Dutch or Belgian business and need invoices, expenses and VAT under control, I'd pick Moneybird. If you sell software or digital products to customers worldwide and want someone else to carry tax and compliance, I'd pick Paddle.
A software company in the Netherlands could reasonably use both. Paddle takes the sales and pays you out, and Moneybird records the payouts and your own costs. Because Paddle is the seller, check how its invoices and payouts reach your bookkeeping before you commit. Ask your accountant what they need.