144Hz means smoother visuals and support for higher FPS but the tradeoff is a smaller screen and slightly worse graphics.
By Acer do you mean Asus VG249Q? And by AOC do you mean 24G2U? Also funnily enough, i heard the ASUS VG249Q had the better stand but other than that it was down to colours. Which is entirely subjective, meaning the AOC 24g2u over saturates things (could possibly make things look prettier) however the asus vg249q has a more accurate colour representation using sRGB.
As Azani said the differences are minor. AOC seems to have a good stand but some strange colour settings, whilst the Acer will lock you to normal overdrive whilst using freesync and the cheap Asus has an awful stand etc etc. Probably worth just going for the one that's cheapest [and available!!!] In theory they're supposed to be around £130-£150 each, not seen that for anything but the Acer though.
https://www.reddit.com/r/Monitors/comments/eqmscz/what_is_the_best_of_these_4_aoc_24g2_vs_acer/ Found this reddit thread on it, it seems generally the Asus ones are better though also the most expensive. but really it seems like you can't really go wrong with any of them
Will they all be as good as each other ? For example I was eyeing the AOC 24G2U but there’s no stock in england so I pulled the trigger on the ASUS TUF VG249Q. Is the Asus or the AOC better ?