Sonu Nigam has established himself as one of the most prominent playback singers in India. He has a versatile voice and has sung in a variety of genres, from romantic melodies to energetic dance numbers. He is known for his soulful renditions and powerful vocals. Sonu Nigam has won several awards, including multiple National Film Awards and Filmfare Awards.
Shaan, on the other hand, has also achieved significant success in the playback singing arena. He is known for his melodious voice and ability to effortlessly convey emotions in his songs. Shaan has sung for numerous Bollywood films and has also recorded chart-topping singles. He has won several awards, including a National Film Award and multiple Filmfare Awards.
Both Sonu Nigam and Shaan have contributed immensely to the Bollywood music scene and have left a lasting impact on Indian music. Ultimately, the choice of who is the "best" playback singer is a matter of personal preference.