system
A chat on subreddit /r/pcmasterrace
human
How does 2 strain your neck more than 1?  1 has a monitor way off to the side.

And anyway, the neck can go 45 degrees (at least) before anything is a strain.
gpt
1 is for people who have a "main" monitor and then a secondary monitor which either may be lower in quality/smaller or just people who game often who don't want to look at their monitors with an angle

2 is for people with matching monitors who mostly use it for productivity but gaming is still kind of viable if you're used to it

source: i use 1 cos my "second monitor" is my laptop screen💀