Sound Quality: The quality of the sounds produced by the keyboard is crucial. Look for instruments with high-quality sound libraries and realistic sound reproduction.
Touch Sensitivity: Touch sensitivity determines how the keyboard responds to your playing dynamics. Weighted keys are often preferred for a more realistic piano feel.
Polyphony: This refers to the number of notes that can be played simultaneously. Higher polyphony is generally better, especially for complex music.
Connectivity: Consider features like MIDI connectivity, USB ports, and audio outputs for connecting to computers, recording devices, and other equipment.
Portability: If you plan to transport your keyboard frequently, consider its weight and size.