All three of those are actually pretty good, with caveats.
The ASUS has issues at lower refresh rates, so if you are playing very demanding games that tend to run with lower than 80fps, you may want to reduce settings in order to keep the frame rates (And thus, the refresh rate) a bit higher. It might also have some issues with strobing crosstalk and brightness dimming in low light rooms. If you use this in a room that tends towards a little brighter, rather than a little darker, it could be a good choice and IS a good monitor.
The Aorus is a really good monitor, has everything you want in a gaming IPS panel but also has some low light problems. Again, probably not the very best choice if you tend to game in dark conditions but an excellent choice if you don't.
The LG, is clearly the superior gaming monitor, but it does have some issues with black uniformity and contrast which for gamers, if that is the majority of what this will be used for, might not be a big deal. Everything else about this panel including an extremely low response time and fantastic motion performance makes it a great choice.
https://www.rtings.com/monitor/reviews/lg/27gl850-b
Probably you will be very happy with any of these, but if the contrast and black uniformity issues don't bother you and you can afford it, the LG is going to likely edge these other two out which is not to say that they are not also good.
I'd probably say LG > Aorus > ASUS.
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