A pure sine wave is considered to be better for power inverters as it provides a smoother and cleaner output compared to other waveform shapes such as square wave or modified sine wave.
A pure sine waveform output mimics the waveform of AC power from the electrical grid, making it compatible with sensitive electronics and appliances that require a clean power source. This is because the output waveform from a pure sine wave inverter is continuous and smooth, with no abrupt changes in voltage, which can cause unwanted interference in the operation of electronics.
In contrast, square wave or modified sine wave inverters produce an output waveform with sharp changes in voltage and abrupt transitions, which can result in power quality issues and cause damage to sensitive electronic equipment.
Therefore, if you want to power sensitive electronics such as computers, televisions, medical equipment, or other delicate equipment, a pure sine wave inverter is the recommended choice.