Is there any variance between 2 monitors of the same type?

[MentalSharps]

What would be the best way to methodically test 2 of these 600hz BenQ's side by side to determine which is best?

[Dalek]

What would be the best way to methodically test 2 of these 600hz BenQ's side by side to determine which is best?

Realistically, you probably won't notice a difference between them. I guess it depends on how OCD you are. I would just buy one, spend a week or two using it and see if you're happy with it. I honestly think you'll be wasting time buying two and trying to see if there's a noticeable difference between a panel.

If you were to test TN monitors side-by-side you would need to:

-Find a way to sit directly in front of them at the same distance - so a wide desk would help with that
-Make sure both monitors are set to the exact same settings
-Plugged in using the same cable (e.g. HDMI / DP)
-Set both monitors to duplicate mode from Windows display settings
-Carefully pixel peep and look at both monitors to see if there's a noticeable difference, e.g. panel uniformity