(Dynamic) Overdrive: Gimmick or useful?

About to take the plunge from a decade+ old HP 1080/60 monitor to either a 38gl950g-b or an 38gn950g-b.

Seems like the main differences are:

1. Price - the N is cheaper than the G due to

2. G having Gsync fpga module vs N having only compatability (I assume more a freesync implementation)

3. G has a fan, N doesn't. Also a presume the fan is a function of having the gsync hardware module.

4)N has HDR 600, while G is HDR 400 (both HDR implementions are crap, as far as I'm concerned, I would probaly just disable, as the dimming zones are more distracting than the supposed value they add to the image quality)

Now, as far as I can tell. the only real difference between the models, is that the G, with the hardware gsync module, provides dynamic overdrive, whereas the N does not.

However, I think the N, being a couple hundred bucks cheaper, and not having a fan. A fan in a monitor. For god's sakes. Seems like a better product.

The only thing I don't really know, is how to weigh "overdrive", much less "dynamic overdrive", into the equation. I get that it is supposed to reduce ghosting, I think at the expense of chromatic aberration?

But how useful is this REALLY? Does it make a difference? Or is this like one of those post processing effects on your tv that you just turn off, because it doesn't have any noticeable effect other than creating input lag.

What's the play here? Is that feature worth a couple hundred extra bucks AND a fan in the monitor? Or is it useless feature hype that you end up turning off anyway?

Is there some other benefit of having the gsync module than dynamic overdrive, that I have missed? It seems like if you have refresh rate sync, then... that's pretty much what the point is. Am I missing something here?

Appreciate any advice!