Better = Faster? Unlike an OPA 627 the OPA637 is not internally compensated for unity gain and is likely to be a lot less stable in the E12DIY. The sort of oscillation that results can sometimes only be seen with a fast oscilloscope and is not good, at best things will get warm and use a lot of power. Not every opamp is interchangeable in every circuit and different headphones can work better with different opamps, especially comparing low impedance iem's and high impedance headphones. Better is often not always better but better with this music or that source device and not to forget different people like different things.
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