If you prefer less vibrance and contrast on your displays, you can tweak your display settings to make the OLED pixels not fully turn off so that black areas look grey like they do on IPS.

And no, ‘better’ isn’t a matter of preference, and it can indeed be quantified to an objective set of metrics such as contrast, brightness, response time, all of which are better on OLED. The only way that IPS wins is not burning in.

So yes, in terms of visual fidelity, OLED is objectively better.