René René thank you for clarification, I’ve send a new message to support.
To answer your question. As Bernd already posted, MasterCard is better accepted outside the Netherlands and Belgium. With a DigiCard MasterCard you can make online purchases.
The reason I would like to have a DigiCard maestro, is to have an extra card I can add to my Apple wallet. So I can make a payment from a different sub account without switching my card between accounts.