I own two Beyer DT880s 250-Ohm & 600-Ohm and the ATH-A900X (closed headphone).
Unless you need to be able to plug the DT880s into a receiver, I would say to get the AD900X.
The DT880 really need to be used with a headphone amplifier.
As the AD900X is only 40-Ohm it can work fine without a headphone amplifier.
(But used with a very low impedance headphone amplifier should bring out it's best)
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