The RTL9210B datasheet highlights several proprietary technologies that give it an edge over competitors like JMicron or ASMedia: Dual-Protocol Auto-Detection
Unlike the standard RTL9210, the "B" version supports both NVMe (PCIe Gen3 x2) and SATA 3.0 (6Gbps) M.2 SSDs. rtl9210b datasheet
The RTL9210B serves as a bridge between a USB 3.2 Gen 2 host and various storage interfaces: Interface Type: USB 3.2 Gen 2 (10Gbps) to PCIe Gen3 x2 / SATA Gen3. Data Rates: NVMe Mode: (~1000MB/s). SATA Mode: bandwidth. Form Factors: Supports M.2 sizes 2230, 2242, 2260, and 2280. Connector Support: Integrated USB Type-C connector logic. ✨ Primary Features Dual Protocol Support: and Apple Silicon).
It plays well with a wider variety of host controllers (Intel, AMD, and Apple Silicon). rtl9210b datasheet