Hey there!

I am going to be making a new build soon. Main parts will most likely include a 6700k and a 980ti Hybrid. (Trying to decide if I'm going to SLI or not still?).
Sadly, as of now I have been gaming on a TV Screen. A 1080p 27'' 60hz TV. And boy, I feel like I have been missing out not having a monitor! So I have decided I am going to get a new monitor with my new build.
I have decided to go 1440p rather than a 1080p or 4k screen.
I have been looking at a lot of monitors, but some certainly caught my eye. Especially the following:

- Asus PG279Q (2560x1440 - 165hz - 27'')
- Acer Predator X34 (3440x1440 - 100hz - 34'')
- Asus PG348Q (3440x1440 - 100hz - 34'')
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Since I've been gaming on a 60hz screen pretty much...well forever, I have no idea what it's like to game on an actual monitor. I saw that the PG279Q has a refresh rate of 165hz. While the other 2 ultrawides have a 100hz refresh.

I am very torn on which monitor to get. (Size is not an issue). Everywhere I looked, I've seen it about 50/50 on which is "better" for gaming. At this point I feel like it's either a higher refresh, or higher resolution.
Though how much of a difference do these "Hz" make? And what would you guys do?