Linkin_1 :
If you have to choose a monitor based on brand which would you prefer from LG, Dell, Smasung, AOC, Acer, Benq etc.
I've had LG, Dell, and Samsung (and still have them all in use). For me, it would boil down to which is the best deal at the time, especially at your price point. Again, remember that LG and Samsung actually make the LCD panels for other monitor makers like Dell, AOC, Acer, and BenQ.
Regarding my experience with ASUS monitors, you can read reviews out there from buyers on Amazon and NewEgg (US website versions) and read for yourself on the amount of people reporting quality control problems (dead pixels, backlight bleed, etc.). My experience was with not one, not two, but three $500+ 2560x1440 ASUS monitors with problems, returning them all and going with Dell. Case in point, ASUS ROG Swift PG279Q. Note the 22% of buyers giving it 1 or 2 stars only. I mean we're talking nearly one of every four purchasers reporting big problems! That's not a good sign:
https://www.amazon.com/PG279Q-2560x1440-G-SYNC-Gaming-Monitor/product-reviews/B017EVR2VM