Dz1on1s :
Asus MG279Q 27.0" 2560x1440 144Hz Monitor maybe this one is better? 220euro cheaper than PG , without g-sync. People say that g-sync is not worth 200 euro. What do you think?
No it isn't.
a) That's Freesync Monitor
b) No ULMB w/ Freesync
c) Slower response and lag times
Dz1on1s :
What is IGP? Acer predators are out of stock in my country. Do you know any better/similar monitor? I was watching Asus ROG PG279Q. Any recommendations?
Yes, I listed them in original post.
As of yet you haven't listed your GFX card which is a big thing...
G-Syn and ULMB work on nVidia cards, suggested to use G-Sync from 30 - 70 fps / ULMB frpm 60 fps - 120 fps)
Freesync works on AMD cards from 40 fps and up, unless provided independently by Monitor manufacturer, no Motion Blur reduction technology
So it's not a matter of choosing what is better, unless you haven't bought your cards yet ... If you have your card(s), the decision has been made for you.
Acer XB270HU has the 27" WS AU Optronics AHVA (M270DAN02.3)
Acer XB271HU lists 27" WS AU Optronics AHVA (can't confirm panel)
Asus PG279Q lists 27" WS AU Optronics AHVA (M270Q008 V0)
Viewsonic XG2703-GS lists AU Optronics M270DAN02.3 (same as 144 hz Acer)