Differential inputs instead of the single-ended inputs of the LM4912 improves noise performance.
Outputs a ground referenced signal instead of a DC biased signal, eliminating the DC blocking capacitors required by the LM4912.
Outputs up to 130mW into a 32 ohm load instead of the 25mW output of the LM4912.
Lower THD+N (0.009% vs. 0.045% for the LM4912).
Higher Power Supply Rejection Ratio (80dB vs. 65dB for the LM4912) allows the amplifier to be operated without a dedicated LDO without sacraficing performance.
Features common-mode sense to eliminate ground loop noise that the LM4912 is vulnerable to.
Benefits of the LM4912 over the MAX9722:
The LM4912 has lower supply current (2mA vs. 5.5mA).