These are different tiers wearing similar category labels. The ClubSport DD 12 is a 12 Nm upper-mid base with the Fanatec QR2 and rim catalogue behind it; the Sport 9 is a 9 Nm entry base that scores higher on our rubric and costs $300 less. On value the Simagic wins comfortably.
So the Fanatec earns its price only if you want the extra torque and the ecosystem - existing Fanatec rims, the QR2 platform. For a budget-led buyer, the Sport 9 is the smarter pick and the cheapest way onto Simagic's 21-bit encoder.