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LG GN750 series monitors (2020) vs HP Zn series monitors 2018
The LG 27GN750-B 27" is a reasonably good Monitor for people with about $550 to spend.
The HP Z27n G2, by contrast, is quite unremarkable and doesn't manage to stand out in any way when compared to other products at that price point.
In either case, we suggest that you first check out a few other options at the $550 budget - it's likely that you'll find some better alternatives.
However, if you nonetheless want to learn more about the LG 27GN750-B 27" and HP Z27n G2, here's a summary of what we know:
The LG 27GN750-B 27" hasn't managed to perform well enough to earn a place in any Monitor roundups conducted by sources that do their own, high-quality, hands-on testing. That alone makes it a hard product to recommend.
Moving on to the HP Z27n G2: no sources that perform reliable and objective hands-on testing have included it in their Monitor roundups, which usually means that a product doesn't make for a good purchase.
As a last step, we wanted to do a head-to-head LG 27GN750-B 27" vs. HP Z27n G2 comparison of their review performance but, unfortunately, weren't able to find any review ratings on either product.