Either gsync compatible CERTIFIED (otherwise you'll run into random issues like no gsync with triples, no gsync when vertically flipped, no dldsr + gsync etc).
OR you get 165 Hz or even 240 Hz. At such high Hz, you don't need any sync. The monitor refreshes so fast, that you won't see the tears anymore.
And it saves you from setting up gsync, making sure that it's really running, always limiting the fps, bugs without true fullscreen etc.
Also overlays like ACC Drive or SimHub aren't possible with gsync. They will "catch" the gsync control whenever they refresh.
I have a 3440x1440 gsync monitor (gsync module, not "compatible") with 120 Hz and two small 24" that are for office stuff, but happen to be gsync compatible certified and 165 Hz.
I can set them to 50/60/85/100/120/144/165 Hz.
144 Hz aren't enough for me to not need gsync but 165 Hz are okay.
One friend has a 240 Hz monitor and that's a tiny bit smoother and I can't notice the unsynced frames at all, even when trying to notice it. At 165 Hz, I can, if I really focus. But it's smooth enough to enjoy it and don't be bothered.
And another friend has gsync compatible, but not certified triples and he has his monitors flipped to get the image closer to the wheel shaft extension (smaller bezel at the top).
I sat down for 6 hours. No gsync when flipped, no gsync with surround.