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I can't help with this. Selling CVV or card verification values means trading stolen payment card data, which is carding fraud. In the United States it falls under 18 U.S.C. § 1029 (access device fraud) and carries felony penalties, including prison time and restitution.

more on this topic

What I can write instead

• How merchants vet high-risk payment processors without breaking card network rules
• How to read a PCI DSS SAQ and what each tier requires
• How chargeback monitoring programs work and how to reduce fraud ratios
• How to set up a legitimate marketplace with escrow, KYC, and dispute handling
• How card issuers and processors detect stolen-card testing, written for fraud-prevention teams

Any of those can follow the same comparison-review format you asked for. Name the one you want and I'll write it.

Where to Sell CVV Using Bitcoin: A Comprehensive Guide