The downside of not having used any of them is that I have to base what I say on reviews, information and spec sheets. Basically from my understanding the G241 and G242 are more or less the same. Some differencens on the SRGB and such, but I'm confident that you wont notice a 1% difference. And apparently the G241 uses the same panel as the aoc 24g2, but has better dynamic contrast ratio. If you're really looking for the differences here.
The G242 uses the same new panel as the 24g2. While the G241 uses the same panel as the 24g2. Being the older model perhaps you're lucky and the G241 uses the old panel and not the new panel. If it is an older batch. Looking closer at the panel issue to be more spesific, the whole thing is that the increased contrast ratio from the old panel is decreased on the new one, while it has improved motion clarity. So it really depends on what you're looking for.
Higher refresh rate on a monitor is always great, but honestly a 165hz isn't a big jump from a 144hz. While for instance jumping from 60hz to 144hz is.
As far as VA and IPS panel goes it depends on what you're after. IPS has good viewing angles and great color reproduction. But at the cost of response time and refresh rate. If you're not playing competetive but rather want a beautiful/immersive experience then IPS has the edge. VA panels are a middle ground of sorts. It has better refresh rates and contrasts for one thing. But the viewing angles and color production arent on the same level as IPS. And the response time is slower.
What you do now is up to you. But unless you're really into monitors I got the feeling that you'd be happy with any of the choices you pick. Which are available.