What's the difference, briefly?
The big Dutch accounting packages — Moneybird, Jortt and e-Boekhouden.nl — are more mature, have more integrations and a far larger user base. They offer their interface in Dutch, and Moneybird also in English and German. None of the three supports Polish, Hungarian or Romanian, and none of them translates the ledger accounts themselves. Booxx is smaller and younger, but works fully in five languages down to the ledger, the outgoing invoices and the explanations of the VAT boxes. If you read Dutch fluently and need a lot of integrations, the established packages are probably the better fit; if you don't speak the Dutch language of bookkeeping, you can't do the core of the work there yourself.