I recently made the jump from a 60hz monitor, to the 165hz Asus ROG Swift - I've done a lot of testing and played many games with the refresh rate set to: 60hz, 120hz, 144hz and 165hz.
Before I got the Swift, I used to think that people could not see beyond 60fps, and anyone that could was either lying or had hyper-sensitive eyes. I can now say that I am actually embarrassed that thats what I thought. The effect of higher frames is very, very obvious.
However, it depends on your eyes when you think the benefit stops being noticeable. For me, I start to struggle to notice the difference after 120hz.
If I did a blind test and really tried, I might be able to tell the difference between 120 and 144 maybe 3/5 times. I would only be guessing if I tried to tell the difference between 144 and 165.
The above is only when Im actually testing and therefore looking out for the difference. When Im actually gaming, its a different story; I immediately notice if my frame rate drops below 75fps in all games (to the point where I actually tune my graphics setting to ensure 75 is the minimum if possible), but if they stay above 80, I never think about it.
In conclusion, I would say that for most people; anything with 100hz or above is a huge step up from 60hz and is definitely worth while. However, I would never say to someone with a 100hz monitor 'you need to try 144hz!' as the difference, while it exists, really doesn't effect you whilst you're actually playing a game and not deliberately looking out for it.
So my suggestion is:
- As you're not a 'competitive shooter player'; if you can happily afford it, and have the GPU horsepower (minimum of a 980/390x, but 980ti/FuryX recommended) to run the 3440x1440p resolution of the X34, then that's what you should go for.