Have both ROG swift and Acer 4k at 60hz, both with gsync. Noticed that with track ir the 144 Hz on the swift causes less eyestrain after an hour even if actual frame rates are lower. I would rather have the super sharp picture of the 4k, but I have impression it's not realistic with quick head movements long term. Plus the inflight menu (right top corner) text becomes too small. Plus even though both have 1ms response time rating the swift seems to have less lag with identical setting.