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Depending on how far you're willing to go, studio monitors are the best option but they also require that you're in a room with proper acoustics. Headphones are great in terms of the quality you get for your money but are not ideal, you only hear one channel per ear exclusively. I only use my headphones to check for tiny flaws in my tracks which are more difficult to hear on monitors, as well as having a second source of reference on mixing/mastering for a different system.