Siemens belongs to the German Siemens Group under the medical equipment products under a branch, the brand is a little louder, the sound quality is louder, softer, the repair rate is relatively large.
Risonda belongs to the Danish Great Northern Group, which only produces hearing-related products, such as Bluetooth headsets, audiometers and hearing aids. The sound quality is softer and not as loud.
The two hearing aids are relatively cheaper in terms of line comparison (e.g., the same computer-programmed Happy Unlimited 2-channel and Mindshow 3-channel), and the pricing is relatively cheaper for Risenta.
You'd better take your family to a professional store to try them all, which sounds comfortable and sound quality fidelity and then buy which. After all, the machine will be worn for years.