Why indeed. Audio sound quality is subjective and thus lends itself to magical thinking and imagined distinctions. The Oppo BDP-105 has been well reviewed and is an established product with outstanding support. Buy the Oppo. The "purist" will urge you to take the Oppo output directly to your amp without an intervening preamp or processor, and that's not bad advice. You may want to sell the Dragonfly DAC.
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