Which gaming monitor should I buy?

I play at home on the Xbox Series X with a 4k 60Herz TV.

The television is there to play the story on quality in games to enjoy the nice atmosphere.

Now I would like to get a small monitor that will be used for online games. 1ms response time with approx. 165 hearts.

Now to my question, is the resolution 1900 times 1080. Or should I buy one with the resolution 2400 × 1900?

At the 2400 resolution, I can still write it down to 1900, but it's more expensive. Or a 1900 which is cheaper for it is enough.

I would like to use my PC for this too.

Get a QHD monitor (2500x1440). Are not that expensive and is a nice resolution. For your requirements you can use this one:

https://geizhals.de/...04341.html

165Hz won't do you any good, as Series X can only output 120 images. Then you can also get the WQHD monitor.

Putting it down is ugly! Better to have a full hd monitor with 144 hertz! Otherwise you will only have a scratchy picture again!