The main difference is that some popular merchants (like Google, Facebook, Microsoft) won't support prepaid cards. That's why all new cards issued by Revolut Business are debit.
If you've been with us for a bit longer, you might still be using some prepaid cards. The easiest way to tell is to go to the Cards tab and see if any of your cards are labelled 'Prepaid card'.
You should replace any prepaid cards with debit cards for better acceptance rates and a better experience.
Note: Until August '20 all cards issued by Revolut Business were prepaid.
If any troubles with your new card order or delivery, you might be eligible for a refund. Raise a support request here.