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I'm the perfect person to answer your question because I got my Asus XG279Q about a week ago and I got it as an upgrade from my PG279Q (the PG279Q is basically identical to the VG27AQ).
First, let me say that I love my PG279Q. The picture quality of my PG279Q is simply amazing. Whether it's the brightness, contrast, colors, refresh rate, build quality and aestetics of the monitor, all of the boxes are checked and get an A+....except for one thing. That one thing is the response time.
The response time of the PG279Q is actually pretty good, comparatively speaking, but it's not quite good enough for me. I only noticed the blurring when I was really really looking for it, particularly only in competitive fist person shooters. But the slower response time was noticeable.
The 1ms advertised response time on the XG279Q was the main selling point for me because I loved everything about my PG279Q except for the slightly slower response time. Well, the XG279Q hits it out of the park because it plays and feels like a TN panel in terms of the responsiveness but maintains the amazing picture quality of my PG279Q.
And I didn't think it would be possible but the picture quality on my new XG279Q actually surpasses that of my PG279Q. The colors are richer and the contrast has improved too, in my opinion.
Hopefully this helps. I think that the XG279Q is about to become one of the most popular and highly rated monitors on the market once more people get their hands on it
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FROM REDDIT