Need help to choose between 2 gaming monitors

[Pepo2915]

Hello, sorry for my english, i need help to choose between 2 gaming monitors.
The first one is the 1440p 27' Acer XB270hu Brpz with GSync.
The second one is the 4K Curved Ultrawide 34' Acer predator X34.
The 27' monitor is 144hz 2160x1440 GSync
The 34' monitor is 100hz is 3440x1440 GSync

My rig
I7 4770k at 4.00Ghz, 16 GB ram, Dual GTX 980ti in SLI.

I mostly play Guild Wars 2, Black Ops 3, Battlefield 4, GTA V, Fallout 4, Dota 2, Resident Evil Series, Dead Space Series and Rocket League.

I have a 32' led tv on my rig now, i mostly play in 1440p on 60hz with vsync on and triple buffering. But i feel that a higher refresh monitor will give me a smother gameplay. Thats why i'm intersted in GSync displays.
The problem is that now i m used to a big display and high resolutions. I know that now i can run games in ultra or high settings without problems. But i was wondering if in the future the 34' ultrawide display will have bad image quality if i use it on a 2560x1080 resolution.

Thanks to all

 

[Chaot1cX]

Given your setup and as you said you are used to a bigger screen as it is. I would probably go with the 4k 34" That way you are able and ready when games start going 4k compatible.

 

[Batman1121]

out of those 2 ,Acer predator x34 is better, but you should also consider ASUS ROG SWIFT PG27AQ which is 4k,27',with g-sync.

 

[RedneckFirework]

i don't know much about monitors but for myself i have a gsync display and it is really worth it because it's basically like having vsync but with almost no input lag