You are knowledgable about this, so maybe you could help or posit a guess, Jojo (or anyone else):
I bought this monitor last week (it was on sale for like $100 less) --
https://www.bestbuy.com/site/acer-xf270h-27-led-fhd-freesync-monitor-black/6096600.p?skuId=6096600 -- to get as little input lag as possible for competitive online
console games (not a PC gamer). I'm currently on a 26" television, and while the frame rate and everything looked good on the monitor, to my total surprise and disappointment, this monitor had MORE controller input lag than my television. Like noticeably, and we're talking a 10 year old TV, not even 1080p, that I dug out of the closet to use over my big and much too delayed 4K television. I'm at a total loss.
Obviously, I want a monitor to upgrade the image quality, but my most important want is as little input delay as possible, certainly as good or better than a 10 year old TV. Acer support was zero help. I'm going to return it, but I'm wondering if there's a certain avenue I should take with brand, model, components, etc. Given I'm on an Xbox, with more limited capacities, excessively high frame rates and resolution > 1080p aren't needed.