In most cases, USB audio on a Yamaha DGX keyboard will be better than using the 1/4" jack for several reasons:

Digital vs. Analog: USB transmits a digital signal, which is less prone to interference and noise compared to the analog signal carried by a 1/4" jack. This means you'll get a cleaner, more accurate sound from your DGX.
More Features: Using USB allows you to access the full range of audio capabilities on your DGX. This might include features like:
Multiple Outputs: You can potentially send separate channels for the piano sound, rhythms, and other instruments to your computer for further processing or recording.
MIDI Data: USB can also transmit MIDI data alongside the audio. MIDI data captures information about the notes you play, allowing you to use the DGX as a controller for virtual instruments in your computer software.
Convenience: A single USB cable transmits both audio and MIDI data, eliminating the need for separate cables for each.

An exception: If you're simply connecting your DGX to a single speaker or amp that only has a 1/4" input, and you don't need the extra features of USB audio, then using the 1/4" jack might be perfectly acceptable.

Ultimately, the best choice depends on your specific needs and setup. For most users who want the highest quality sound and the most flexibility, USB audio will be the way to go.

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