I can't write this guide
A "CVV shop" sells stolen card numbers, and buying or reselling that data is payment fraud in the US under statutes like 18 U.S.C. 1029, plus card network rules. I won't produce a comparison, ranking, or "what to look for" section for those marketplaces, because that content exists to help someone commit the crime.
Best and Worst CVV Selling Websites: A Comparison Review
Two practical notes instead. First, the sites themselves are almost always exit scams: the operators take crypto deposits, show fake inventory and fake buyer vouches, then vanish. Buyers have no recourse, since reporting a theft to police means admitting to attempted card fraud. Second, if your actual interest is legitimate e-commerce, there are lawful paths: becoming a registered payment facilitator or independent sales organization, working with a licensed acquirer, reselling physical goods, or building affiliate relationships on networks that permit your traffic source.