Gonna answer the guidelines first.
1. What do you plan to do with this monitor? (ex. Games, Movie Watching, Photo Editing, etc.)
competitive Gaming "FPS"
2. What resolution and screen size do you want?
1080p or 1440p
23.8 up to 27
3. What refresh rate do you want? (ex. 60 hz , 70 hz.)
240hz...