These are my monitor frequency/refresh rate thoughts.
The frequency (60Hz or 75Hz) is the number of times the monitor redraws the screen per second, so it’s also your maximum effective framerate (you’ll get higher FPS, but the monitor isn’t able to show all the frames fully and you get tearing. At that resolution, you shouldn’t struggle to hit 75FPS. Higher resolutions tend towards lower refresh rates (it’s an oversimplification but you can think of it as having to push the number of pixels multiplied by the refresh rate, so a higher resolution will be harder to push and refresh the whole screen less often). There are also certain trends, like TN panels having lesser image quality but higher refresh rates, as they’re a different technology to IPS panels. IPS often have better viewing angles, or colour representation, and older TN panels were a lot more prone to ghosting, though that’s less of an issue now. That’s when the response time comes into play, as it’s the time it takes for the pixels to change colour. So yeah, the screen refreshes, but each individual pixel does too, so if that time is higher (25ms used to be very common, compared with 1ms), the screen refreshes but depending on the contrast, the previous image would remain as a ‘ghost’ until all the pixels had refreshed.
V-sync in games locks the game to a certain frequency, usually matching your monitor, or sometimes halving it (some stuff, often menus, cut scenes etc run at 30fps anyway), and reduces the tearing you’d get if you were getting a higher in game FPS than the monitor’s refresh rate.
It’s all down to personal preference; you can get higher refresh rate monitors, higher end GPUs to get a higher FPS, and you’ll get a much smoother experience. G-Sync or Freesync will then tie the monitor to the rate that the GPU is outputting and keep things super smooth, if you go that route.
Or, you might find that anything above 60fps is lost on you, either because your monitor is 60Hz or because you just don’t pick up on the extra ‘smoothness’ of having higher FPS. I’m in this boat, so my monitor is 60Hz, i run everything with vsync or capped to 60fps and things looks great and feel plenty smooth for me. Some folk are more sensitive to visual stability/fluidity more than others; e.g. from how he’s described it in the past, @vredesbyrd would be in that boat.
It’s one of those things that horribly expensive or difficult to try before you buy unless you’re fortunate enough to have access to a variety of monitors you can try with YOUR PC, playing the games YOU play
Sorry, i should point out the above is also in reference to the fact you’ve listed a Freesync monitor, which is quite a specific thing to go for, and I’m not sure if that was your intent.
What GPU are you using Mic?