I have not used any of those specific monitors, but there are in depth reviews of the second two, and I can make some assumptions about the first.

The 27GS60QC-B is a VA panel. That means much better contrast, but worse viewing angles as well as fairly nasty overshoot leading to "black smearing" where you'll get long black trails behind some objects. This is true of all VA panels, even the high end Samsung ones.

The 27GR75Q-B is really nice IPS monitor. And probably the "best" of the three options here, at least within your budget. Yes it's only 165hz, but it can actually display 165hz with no overshoot which neither of the other two monitors can claim. Meaning it'll have the least amount of ghosting and sharpest motion. Especially when using backlight strobing at the same time, though it doesn't support VRR w/ strobing so you can only use it if you can maintain 100fps, 120fps, or 165fps in a game and explicitly set that as your display's refresh rate.

The 27GR83Q-B is also a really nice IPS monitor. Better than the 27GR75Q-B in some ways, most obviously the max refresh rate, but also in console support where it can accept a 4k 120hz HDR VRR input from either the PS5 or Xbox Series X and it'll downscale it to 1440p. That said, it's not really 170€ better. Unless you have a GPU and play games actually capable of 240fps at 1440p, then it's probably not worth pushing your budget up to get it.