I've been on a bit of a monitor saga recently. 1080p 60hz to 1080p 144hz to 1440p 144hz to 2560*1024 21:9 75hz and 3440*1440 21:9 60hz, and have come to the conclusion that, for me at least, hz comfortably trumps resolution in gaming. Not just gameplay wise, but also visually. Obviously it's nice to have both, but budget and conscience can get in the way of that 
As much as gsync and freesync improve the image at lower rates, to my eyes, things still don't look good at 40-50 fps. Better than without, sure, but not great. 1080p at 75fps looks a whole load better than 1440p at 50fps, for example. Even the jump from 60hz to 75hz is enough for me to prefer a hit in native resolution to maintain. One day we'll all be running 4k+ screens at 500fps, no doubt, but until that point, what's your priority? I'm personally hoping for a decent 2560*1080p 21:9 at 200hz in the semi near future.

As much as gsync and freesync improve the image at lower rates, to my eyes, things still don't look good at 40-50 fps. Better than without, sure, but not great. 1080p at 75fps looks a whole load better than 1440p at 50fps, for example. Even the jump from 60hz to 75hz is enough for me to prefer a hit in native resolution to maintain. One day we'll all be running 4k+ screens at 500fps, no doubt, but until that point, what's your priority? I'm personally hoping for a decent 2560*1080p 21:9 at 200hz in the semi near future.
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