It should be 27 inches, 144 Hz and wqhd resolution my budget is 500 euro
PS games on xbox one and soon on sieres x which has 120 fps
Should be for gaming
Take a look at the Acer Predator.
OK
Acer KG1 (KG271UAbmiipx)
Best to look at Amazon
Are there different ones because I'm not very familiar with them?
LG 27GL850-B
It depends on what kind of panel you want to have.
As sgt119 wrote, the LG 27GL850. If you would accept curved for a significantly better contrast, the Samsung C27HG70 is also worth a look.