Mostly, as a user, the main thing that I'm looking at is interchange revenue sharing (the main thing that makes a difference). This can vary for personal and business cards and can be a non-trivial revenue source. If this is not competitive, having the well-known Stripe integration convenience doesn't go that far. I'd rather suck it up and work with an old-school CC vendor if this means the company gets a better interchange rev-share.

Mastercard's prepaid debit cards are quite popular with fintech startups.

This implies debit as the underlying mechanism for completing the transaction, however one could presumably build a credit-based business using these cards. If XYZ company issues a Stripe card under a credit model, then XYZ company would be footing the bill using their Stripe balance, and the cardholder would then have a credit balance with XYZ company.