The Lynx 4S is known for its solid performance, features like telemetry, and advanced programmability, which could be beneficial for racing and managing multiple vehicles.

However, if you’re looking for something with more modern features, a newer interface, or better support, the Radiomaster MT12 could be a good upgrade. The MT12 is versatile, with multi-protocol capabilities, making it easier to manage different models and brands, which could streamline your setup if you have various RTR radios.

In summary, if the Hitec Lynx 4S meets your needs and you're comfortable with it, there may not be a pressing reason to switch. But if you’re looking for a more future-proof system with modern features, the Radiomaster MT12 might be worth considering.