@New-Teal-Tiger-1431571177#213569 Hi Nikolai, willkommen in Deutschland! Und willkommen im Community-Forum von bunq!
Concerning the Mastercard Credit: Rest assured, with bunq you will never have any SCHUFA-related problems. They are a Dutch bank and they don't work with them at all. And on top of that, while they indeed have a Mastercard Credit, they don't give you any credit lines. So even if they had a relationship with SCHUFA, this card would not need get reported or anything like that. For you as a user, it works exactly like a debit card. For the merchant, it is a credit card. Giving you the advantage of better acceptance at car rentals, hotels etc.
And about the Maestro card: This card works in every country, but only in stores where it is accepted. While in Netherlands and Belgium you won't be able to do much without a Maestro card, in Germany you can generally use both Mastercard and Maestro in most stores. So it's not as necessary here, but of course you can use it without problems.
About the Metal card: This is also a Mastercard Credit. But, same as the plastic Mastercard Credit, it also works for you fully as a debit card and you can not fall in debt. So, if you don't need the bling ✨, you can just go for the Mastercard Credit and you get the "same card", just in a different packaging. And btw: The Metal Card itself is free, the only requirement is pre-paying for your bunq plan. If you plan on staying with bunq anyway, there's not really a difference monetarily, as you need at least the easyMoney plan anyways to fully use bunq as your bank account.
And just to finish this with a little information about the Online/Virtual cards: These are also just Mastercard Credits, and indeed they can even be converted to real physical cards at anytime after creation. They're great if you do most your shopping with Apple Pay/Google Pay and online. No need to produce a plastic card if you pay with your phone all the time anyway, right?
And now: the choice is yours! If there was anything unclear, feel free to ask :)