Acer or HP g sync 1440p. monitor?

Oct 10, 2018
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Hi guys I'm new to this forum so please be gentle;)
I'm planning to upgrade my 1080p. monitor to 1440p. ones I upgraded gpu to RTX 2080 what I'm looking for is
1. 144hz
2. g sync
3.low input lag/response time 1or2 ms.
4. 27 inch
I'm not really sure do I need an IPS panel because I'm using pc for online gaming like CS only
my budget is around €500 but I would spend couple € more if I have to.
I have found two monitors and need an advise witch one will be better for me.
1.is brand new 27" Acer Predator XB271HUA (€550)
2. Refurbished HP Omen 27" (€470)
if there is something out that I have missed and is worth to look at it please let me now ...Thanks